Question

Which sentence uses an indefinite article? A. That huge statue is interesting. B. When did your parents go to the movies? C. He is planning a trip to California.

Answer 1

B. When did your parents go to the movies is the anwser to your question

Answer 2

C uses an indefinite article. That is the article a. A uses That which is a definite article and we know that, because it refers to one thing not to be confused with another: That huge statue. B uses the article the, which is definite because we know his/her parents went to the movies, not just any random movie.