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: staying warm has a positive impact on an animal 's survival, Fact2: Furry animals grow thicker coats to keep warm in the winter., Question: Furry animals grow thicker coats which has what impact on their survival? (A) heat (B) positive (C) negative (D) energy (E) ironic (F) Energy. (G) decreased (H) adding heat
[A]: B

[Q]: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate
[A]: E

[Q]: Fact1: a cactus stem is used for storing water, Fact2: A striking cactus plant from Mexico., Question: What can be used for storing water? (A) marshes and swamps (B) Something made from fermented ricce (C) Something that grows in Mexico (D) plankton and nonliving organic (E) roots and shoots (F) evaporative cooling (G) A transportation fuel (H) that material's properties
[A]:
C