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 : _ aba _ cabc _ dcba _ bab _ a

A. abdca
B. bcadc
C. abcdd
D. cbdaa

Answer: Option A

Explanation:

The series is aababcabcddcbacbabaa.

Thus, the letters equidistant from the beginning and the end of series are the same.