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: high pressure systems cause clear weather, Fact2: High barometric pressure indicates clear weather., Question: What causes clear weather? (A) our nearest star (B) electromagnetic energy (C) looseness of dirt or compost (D) Animal survival (E) The area was once underwater (F) evaporation (G) barometric pressure (H) windpower operated machines
G