Series Completion - Verbal and Reasoning

Directions to SolveIn each of the following questions, various terms of an alphabet series are given with one or more terms missing as shown by (?). Choose the missing terms out of the given alternatives.
Q1:

ejo tyd ins xch ?

A nrw

B mrw

C msx

D nsx

E nsw

ANS:B - mrw

There is a gap of four letters between the first and second, the second and third letters of each term, and also between the last letter of a term and the first letter of the next term.