// author : sentheta aka vanwij
#ifdef VANWIJ
#include"/home/user/code/bits/stdc++.h"
#define DBG 1
#else
#include"bits/stdc++.h"
#define DBG 0
#endif
using namespace std;
#define Int long long
#define V vector
#define pii pair<int,int>
#define ff first
#define ss second
static mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
#define pow2(x) (1LL<<(x))
#define msb(x) (63-__builtin_clzll(x))
#define bitcnt(x) (__builtin_popcountll(x))
#define nl '\n'
#define _ << ' ' <<
#define all(x) (x).begin(), (x).end()
#define rep(i,a,b) for(int i = (int)(a); i < (int)(b); i++)
#define cerr if(DBG) cout
#define dbg(x) {cerr << "?" << #x << " : " << (x) << endl << flush;}
#define int long long
// const Int MOD = 1e9+7;
const Int MOD = 998244353;
Int bpow(Int a,Int b){
Int ret = 1;
for(;b; a=a*a%MOD,b/=2) if(b&1) ret = ret*a%MOD;
return ret;
}
Int inv(Int a){return bpow(a,MOD-2);}
void solve(); int TC, ALLTC;
signed main(){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); cout << fixed << setprecision(7);
// cin >> ALLTC; for(TC=1; TC<=ALLTC; TC++) solve(); return 0;
solve();
}
const int N = 1e5+69;
const int LN = 18;
const int SN = 400;
int hilbert(int x, int y){
int d = 0;
for(int s=1LL<<(LN-1); s; s>>=1){
bool rx=x&s, ry=y&s;
d = d<<2 | rx*3^ry;
if(!ry){ if(rx){
x = (1<<LN)-x; y = (1<<LN)-y;
} swap(x,y); }
} return d;
}
int n, m, q;
int a[N];
// tree utilities
V<int> adj[N];
int d[N], p[N];
int getMinDepth(int x,int y){
return d[x]<d[y] ? x : y;
}
int getMaxDepth(int x,int y){
return d[x]>d[y] ? x : y;
}
struct Stable{
int v[2*N][LN];
void build(){
rep(lg,1,LN) for(int i=0; i+(1<<lg)-1<2*N; i++)
v[i][lg] = getMinDepth(v[i][lg-1], v[i+(1<<(lg-1))][lg-1]);
}
int qry(int l,int r){
int lg = __lg(r-l+1);
return getMinDepth(v[l][lg], v[r-(1<<lg)+1][lg]);
}
} stable;
int t[N], tim;
int getLca(int x,int y){
if(!(t[x]<t[y])) swap(x,y);
return stable.qry(t[x],t[y]);
}
void dfs_init(int x=1){
t[x] = tim;
stable.v[tim++][0] = x;
for(int y : adj[x]) if(y!=p[x]){
d[y] = d[x]+1;
p[y] = x;
dfs_init(y);
stable.v[tim++][0] = x;
}
}
// s = {t[nodes]}
multiset<int> s;
int pathlen = 0;
int getSemipath(int i,int j){
// return d[stable.v[j][0]] - d[stable.qry(i,j)];
assert(i <= j);
int u = stable.v[i][0];
int v = stable.v[j][0];
return d[v] - d[getLca(u,v)];
}
void insert(int i){
auto it = s.insert(i);
// remove prv-nxt
if(it!=s.begin() && it!=prev(s.end())){
int prvi = *prev(it), nxti = *next(it);
pathlen -= getSemipath(prvi, nxti);
}
// connect prv-i
if(it!=s.begin()){
int prvi = *prev(it);
pathlen += getSemipath(prvi, i);
}
// connect i-nxt
if(it!=prev(s.end())){
int nxti = *next(it);
pathlen += getSemipath(i, nxti);
}
}
void erase(int i){
auto it = s.find(i);
// remove prv-i
if(it!=s.begin()){
int prvi = *prev(it);
pathlen -= getSemipath(prvi, i);
}
// remove i-nxt
if(it!=prev(s.end())){
int nxti = *next(it);
pathlen -= getSemipath(i, nxti);
}
// connect prv-nxt
if(it!=s.begin() && it!=prev(s.end())){
int prvi = *prev(it), nxti = *next(it);
pathlen += getSemipath(prvi, nxti);
}
s.erase(it);
}
int ql[N], qr[N], qans[N];
int qhsh[N];
void solve(){
cin >> n >> m >> q;
rep(i,0,n-1){
int u, v;
cin >> u >> v;
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs_init();
stable.build();
// rep(i,1,n+1) cerr << t[i] << " ";
// cerr << nl;
rep(i,1,m+1){
cin >> a[i];
}
V<int> ord;
rep(i,1,q+1){
cin >> ql[i] >> qr[i];
ord.push_back(i);
// qhsh[i] = hilbert(ql[i], qr[i]);
}
sort(all(ord),[&](int i,int j){
if(ql[i]/SN==ql[j]/SN) return qr[i] < qr[j];
return ql[i]/SN < qr[j]/SN;
// return qhsh[i] < qhsh[j];
});
int l=1, r=1;
insert(t[a[1]]);
for(int i : ord){
while(ql[i] < l) insert(t[a[--l]]);
while(r < qr[i]) insert(t[a[++r]]);
while(l < ql[i]) erase(t[a[l++]]);
while(qr[i] < r) erase(t[a[r--]]);
assert(l==ql[i] && r==qr[i]);
// leftmost and rightmost node
int li = *s.begin();
int ri = *prev(s.end());
int u = stable.v[li][0];
int v = stable.v[ri][0];
int lca = getLca(u,v);
dbg(pathlen);
int ans = pathlen + d[u]-d[lca];
// int ans = pathlen + d[stable.v[li][0]]-d[stable.qry(li,ri)];
qans[i] = ans;
}
rep(i,1,q+1){
cout << qans[i]+1 << nl;
}
}
