What will come in place of the question mark (?) in the following letter series? A, D, I, P, ? MCQ with Answer and Explanation

Explanation:
First letters: E, I, M, Q, U (+4). Second letters: G, K, O, S, W (+4). The next term is UW.

Explanation:
The second and fourth letters (K and L) are static. The first and third letters are in alphabetical order starting with C. So, the missing letters are IKJL.[reference:11]

Explanation:
R(18)+3=U(21), U+5=Z(26), Z+7=G(33→7), G+9=P(16), P+11=27→A. So A.