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.

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.

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