Select the correct and entire main clause of the sentence. cathy went to the store because we were out of milk. the main clause is

The main clause is Cathy went to the store.
A main clause is simply the part of sentence that can stand on its own, hence its is independent. A main clause is a group of words made up of a subject and a predicate. It can stand alone as a sentence. A main clause is also known as an independent clause, a super ordinate clause, or a base clause.