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 travel, Fact2: Trucks and cars are vehicles., Question: what are used for travel? (A) The Alps (B) pogo sticks (C) couches (D) trucks and cars (E) snow, ice, and rock (F) seatbelts (G) chemical messengers (H) permeable walls
A:
D