Given the task definition and input, reply with output. 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").

Fact1: seat belts are used for preventing injuries to passengers in cars, Fact2: Helmets prevent injuries and death., Question: What do seat belts and helmets do? (A) destroy (B) change an ecosystem (C) safe driving (D) protect passengers (E) only discomfort people (F) hurt people (G) oxygen spreads into the air (H) safe operation
D