Solution:The pattern followed here is :
{1st letter + 2 = 2nd letter}, {2nd letter + 3 = 3rd letter} & {3rd letter + 4 = 4th letter}
LNQU → (L + 2 = N), (N + 3 = Q) & (Q + 4 = U)
QSVZ → (Q + 2 = S), (S + 3 = V) & (V + 4 = Z)
ACFJ → (A + 2 = C), (C + 3 = F) & (F + 4 = J)
But,
KMQT → (K + 2 = M), (M + 3 ≠ Q) & (Q + 4 ≠ T)
Hence, KMQT is the correct answer.