It would be much easier to help you if you mentioned what's the name of the story. Anyway, I think I've got what you mean. I hope you will find it helpful.
Here are the answers: 1. C.) Blackie<span> was the original leader of the gang.
2. The </span>C.) staircase<span> stuck up like a jagged tooth.
3. The gang’s plans for the day were decided by </span>B.) a vote. <span> Sorry if something is wrong. In my view all of them are correct.
"<span>C. She was able to answer most students' questions"" is incorrect because student should be singular. It should </span>be "<span>She was able to answer most of the students' questions.</span>"
