Discussion

Choose the correct option to complete the alphabet letter series.

AB __ B, BC __ C, __ AB __, AB __ B

Answer: C

The missing letters are CACAC.

Filling the blanks in order gives the groups

ABCB, BCAC, CABA, ABCB

Each group is a rotation of ABC followed by its own middle letter: ABC + B, BCA + C, CAB + A, and then the cycle returns to ABC + B.

The other options break a group: CCAAC makes the second group BCCC, CBABC makes it BCBC, and BCCAB makes the very first group ABBB.

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