Z, S, W, O, T, K, Q, G, ? - Alphabet Series - Series Completion - Verbal Reasoning question

In following alphabet series , one term missing as shown by question mark . Choose missing term from options. - Z, S, W, O, T, K, Q, G, ?

A. N, C

B. N, D

C. O, C

D. O, D

E. None of the above

Answer: A. N, C

The given sequence consists of two series :
I. Z, W, T, V, Q, ? in which each letter is moved three steps backward to obtain the next term.
II. S, O, K, G in which each letter is moved four steps backward to obtain the next term.

Posted in: Alphabet Series - Series Completion - Verbal Reasoning