Select the choice in which a colon is properly used.

A) She asked me: what I was doing.
B) Jonathan: my acquaintance from church: knocked on my door last night.
C) Here are the people who attended the gathering: Pete, Johann, Webber, and Gina.
D) "Star Wars" was a hit in 1977: but the sequel, "The Empire Strikes Back," is generally thought of as a better movie.