#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long
using i64 = long long;
template <class F, class _S>
bool chmin(F &u, const _S &v){
bool flag = false;
if ( u > v ){
u = v; flag |= true;
}
return flag;
}
template <class F, class _S>
bool chmax(F &u, const _S &v){
bool flag = false;
if ( u < v ){
u = v; flag |= true;
}
return flag;
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n, m, q; cin >> n >> m >> q;
vector <vector<int>> G(n);
for ( int i = 1; i < n; i++ ){
int u, v; cin >> u >> v;
--u, --v;
G[u].pb(v), G[v].pb(u);
}
vector <int> C(m);
for ( auto &x: C ){
cin >> x; --x;
}
while ( q-- ){
int l, r; cin >> l >> r;
--l, --r;
int s = r - l + 1;
vector <int> sub(n), hv(n);
for ( int i = l; i <= r; i++ ){
sub[C[i]]++;
hv[C[i]] = true;
}
auto dfs = [&](auto dfs, int u, int p) -> void{
for ( auto &v: G[u] ){
if ( v != p ){
dfs(dfs, v, u);
sub[u] += sub[v];
}
}
};
dfs(dfs, 0, -1);
int ans = 0;
auto dfs2 = [&](auto dfs2, int u, int p) -> void{
bool flag = false, vs = false;
for ( auto &v: G[u] ){
if ( sub[v] ){
if ( !vs ) vs = true;
else flag = true;
}
}
if ( hv[u] || flag ) ++ans;
for ( auto &v: G[u] ){
if ( v != p ){
sub[u] -= sub[v];
sub[v] += sub[u];
dfs2(dfs2, v, u);
sub[v] -= sub[u];
sub[u] += sub[v];
}
}
};
dfs2(dfs2, 0, -1);
cout << ans << ln;
}
cout << '\n';
}
