Choose the missing terms out of the given alternatives : PMT, OOS, NQR, MSQ, ?

Answer: Option A

1st letter : P - 1 = O - 1 = N - 1 = M - 1 = L
2nd letter : M + 2 = O + 2 = Q + 2 = S + 2 = U
3rd letter : T - 1 = S - 1 = R - 1 = Q - 1 = P