What should come in place of the question mark (?) in the given series based on theEnglish alphabetical order?

ABC, FGH, LMN, STU, ?​

Given: ABC, FGH, LMN, STU, ?

Logic: Letters are increasing + 5, + 6, + 7 and + 8 place.

A + 5 → F, F + 6 → L, L + 7 → S, S + 8 → A

B + 5 → G, G + 6 → M, M + 7 → T, T + 8 → B

C + 5 → H, H + 6 → N, N + 7 → U, U + 8 → C

So, the missing term is ABC.

Thus, correct option is (a).