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 : adb _ ac _ da _ cddcb _ dbc _ cbda

A. bccba
B. cbbaa
C. ccbba
D. bbcad

Answer: Option B

Explanation:

The series is adbc acbd abcd dcba dbca cbda.

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