Question

All of the following word groups show parallelism except __________.

Answer 1

All of the following word groups show parallelism except smiling at my mother, when I cleaned my room, to ask my parents for a favor.
Parallelism refers to the usage of the same form throughout a sentence or a list of phrases. You can see that A, B, and D all have the same form in all of these examples, whereas in C they vary.

Answer 2

smiling at my mother, when I cleaned my room, to ask my parents for a favor