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: Earth orbiting the Sun causes seasons to change, Fact2: Weather changes from season to season., Question: What causes weather changes? (A) the moon (B) the earth orbiting the sun (C) degrees Celsius (D) the environment (E) agriculture (F) Greenhouse gases (G) global warming (H) rivers
A:
B