Question

Which one of the following groups of words is a fragment?

A. In December, we usually take a skiing trip.
B. The Carters enjoy vacationing at the lake.
C. Strolling in the park on a summer afternoon.
D. Talking on the phone is her favorite pastime.

Answer 1

(C). Strolling in the park on a summer afternoon.

There is no subject in this sentence, so you don't know who or what is strolling in the park.