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: heat can change the state of matter, Fact2: Heat and temperature are the same thing., Question: What can change the state of matter? (A) temperature (B) color (C) a-a gradients (D) electricity (E) hypothyroidism (F) fossil fuels (G) global warming (H) flavor

A: A
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Q: Fact1: recycling has a positive impact on the environment, Fact2: Steel is a recycled and recyclable product., Question: What has a positive impact on the environment? (A) animals (B) bushes (C) energy (D) peachleaf willow (E) oysters (F) using steel (G) Solar energy (H) Green beans

A: F
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Q: Fact1: Evolution occurs by a process called natural selection., Fact2: Evolution is a sequence of variation and selection., Question: what produces variation? (A) animals (B) evolution (C) pollen (D) environment (E) a doorbell (F) movement (G) seasons (H) competition

A:
B
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