Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
JKL3, KJM4, LIN5, MHO6, ?

Given: JKL3, KJM4, LIN5, MHO6, ?

Logic: 1st letter + 1, 2nd letter - 1, 3rd letter + 1 and number + 1 place.

For, 1st letter

J + 1 = K, K + 1 = L, L + 1 = M, M + 1 = N

For, 2nd letter

K - 1 = J, J - 1 = I, I - 1 = H, H - 1 = G

For, 3rd letter

L + 1 = M, M + 1 = N, N + 1 = O, O + 1 = P

For, number

3 + 1 = 4, 4 + 1 = 5, 5 + 1 = 6, 6 + 1 = 7

So, the missing term is NGP7.

Thus, correct option is (d).