The fourth revision is correct. it says who was strolling in the sidewalk.
I think it said/was throwing, hope this helps
The predicate is the part of the sentence that tells what the subject is all about. A compound predicate consists of two main verbs along with its complements which describes the subject. In the given sentence above, the portion that contains a compound predicate is NONE. There is no compound predicate in the sentence, since the predicate is only "were a popular comedy team on radio, television, and stage." The correct answer would be option D.
People live both in the natural and the symbolic environment