1. 

In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four/five alternatives below the series. Find out the correct alternative.

pqr__ __rs__rs__ __s__q__
A. spqpprr
B. pqrrppq
C. sqppqpr
D. sqprrqr

Answer: Option C

Explanation:

Pattern of the series as shown below

pqrs/qrsp/rspq/spqr=> sqppqpr

Hence, the missing letters are sqppqpr.