What will come in place of the question mark (?) in the following letter series? AC, BD, CE, DF, ? MCQ with Answer and Explanation

Explanation:
First letters: H, I, J, K, L (+1). Second letters: J, K, L, M, N (+1). The next term is LN.

Explanation:
The middle letters follow the order A, B, C, D, E. The first and third letters are in alphabetical order starting with G. So, the missing term is OEP.[reference:12]

Explanation:
First: Q, W, C, I, O (+6 each, wrap). Second: T, Z, F, L, R (+6 each, wrap). So OR.