1.  BCB, DED, FGF, HIH, ___

A. JKJ
B. HJH
C. IJI
D. JHJ

Answer: Option A

Explanation:

This series consists of a simple alphabetical order with the first two letters of all segments: B, C, D, E, F, G, H, I, J, K. The third letter of each segment is a repetition of the first letter.