The answer is a. The word "but" is helping connect two sentences which makes it a compound sentence
In "Strange Case of Dr. Jekyll and Mr. Hyde", by Robert Louis Stevenson, Utterson and Enfield are taking their usual walk. It is a Sunday. They come to the front of the door in which they have seen Hyde enter and is also the back way to Dr. Jekyll's place. They think of inviting Dr. Jekyll to join them for a walk. They reach the middle window that is half-open and Utterson sees Dr. Jekyll sitting beside the window. When he is addressed Dr. Jekyll answers he is very low, and that this state won't last very long. He says that he is very glad for the invitation but that he dares not to go. He cannot let them in either, because the place is not fit. They plan to talk from where they are. The smile on Dr. Jekyll's face gives place to an expression of terror and despair, as he shuts the window hastily.
I would say that the correct answer is A) The people along the curb are smiling and waving. It shows the correct subject-verb order.
Collaboration can help participants express their feelings towards the subject
