Which alphabet letter should replace the question mark?
N T | F H | G M
P R | J L | ? I

Correct Answer: (B) K

Each $2$$\times$ 2 block forms a set of consecutive numbers in the alphabet: Block 1 contains consecutive even numbers 14(N), 16(P), 18(R), 20(T); Block 2 contains consecutive even numbers 6(F), 8(H), 10(J), 12(L); Block 3 contains consecutive odd numbers 7(G), 9(I), 11(K), 13(M). Thus, the missing letter is 11, which corresponds to K.