Question

Choose the sentence that uses commas correctly. Consider that the correct sentence may not require commas. We have seen apes at the zoo on TV and in movies. We have seen apes at the zoo, on TV, and, in movies. We have seen apes at the zoo, on TV, and in movies. We have seen apes at the zoo on TV, and in movies.

Answer 1

The correct answer is the third line. 

Your question is a form of listing. When you list more than two things, you use commas.