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: Mating is generally preceded by courtship., Fact2: For example, a black rooster and a white hen mate, and the resulting offspring are gray., Question: What can result in offspring? (A) seeds (B) competition (C) courtship (D) travel (E) resistance (F) solitude (G) litter (H) reading

A: C
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Q: Fact1: Evolution occurs by a process called natural selection., Fact2: Adaptation is the result of natural selection., Question: What leads to evolution? (A) Plants growth (B) competition (C) Adatation (D) our star (E) Experimentation (F) Stagnation (G) environment (H) Information

A: C
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Q: Fact1: blowing air into a whistle causes air to vibrate inside the whistle, Fact2: All sounds begin with vibrations., Question: what do whistles use to make sound? (A) Collagen (B) air (C) Energy. (D) power (E) oxygen (F) waves (G) friction (H) energy

A:
E
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