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#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    cin >> n;

    while (n--)
    {
        int a, b, k = 10000, pos;
        cin >> a >> b;
        int arr[a];
        for (int i = 0; i < a;i++)
        {
            cin >> arr[i];
        }
        for (int i = 0; i < a;i++)
        {
           if(abs(b-arr[i])<k)
           {
               k = abs(b - arr[i]);
               pos = i + 1;
           }
        }

            cout << pos << "\n";
    }
}