Question

what is the meaning of jump on the bandwagon?
khalil usually doesnt follow trends, but he jumped on the bandwagon and bought those sneakers.
to sound familiar
to do the popular thing

Explanation:

The phrase "jump on the bandwagon" is an idiom. In the context, Khalil usually doesn't follow trends but bought the sneakers. This indicates doing what is popular. "To sound familiar" doesn't fit the context.

Answer:

to do the popular thing