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: an anemometer is used to measure wind speed, Fact2: Hurricanes have five categories depending on wind speeds., Question: Which tool is used to determine hurricane category? (A) lamphreys (B) an anemometer (C) melanin content (D) chemical messengers (E) classified (F) predicting weather (G) Cladistics (H) melanin amount
B