Read the following sentence. Then, answer the question.
Ben wants to go to the zoo but his sister is not feeling well.
Which statement is correct?
No comma is needed because a dependent clause follows an independent clause in this sentence.
A comma is needed in this sentence after the word "but" to separate the two independent clauses.
No comma is needed because this is a simple sentence that expresses only one idea.
A comma is needed after the word "zoo" to separate the two independent clauses joined by the conjunction.