A: I might decide that I like you less than I thought I did.

This is right, but D is correct, so be sure to read all options before making your final selection on the test.

According to balance theory we strive to have balanced cognitions.  It is impossible to change the behavior of striking another, so instead a cognition is changed.  Deciding that I like you less than I thought I did would follow from the balance theory (see below)