In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: a vehicle is used for transportation, Fact2: Cars and busses are both examples of vehicles., Question: What are busses used for? (A) Protective shelter (B) Transporting humans (C) help other species benefit (D) Transporting airplanes (E) A backbone (F) Communication (G) safe operation (H) safe driving
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
B