In this type of questions, a series of single, pairs or groups of letters or combinations of letters and numerals are given. The terms of the series form a certain pattern as regards the position of the letter in the English alphabet. Find the missing or wrong term in series 

1)

Z, W, S, P, L, I, E, ?


A) B

B) D

C) F

D) K

Answer:

Option A

Explanation:

$Z - 3 \rightarrow W, W - 4 \rightarrow S, S - 3 \rightarrow P,$

$P - 4 \rightarrow L, L - 3\rightarrow I, I - 4\rightarrow E, E - 3\rightarrow B$

Hence the answer is (a).