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: an anemometer is used to measure wind speed, Fact2: An anemometer is a device that measures the force of the wind., Question: The force of the wind can be used to measure its what (A) shaking (B) speed (C) inches (D) pitches (E) humidity (F) bar (G) weight (H) rain probability
A:
B