1.  In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative : c _ baa _ aca _ cacab _ acac _ bca

A. acbaa
B. bbcaa
C. bccab
D. cbaac

Answer: Option A

Explanation:

The series is cab / aa / cacab / cacab / aa / cacab / ca.

Thus, the pattern cacab, cacab, aa is repeated.