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").

[EX Q]: Fact1: Some viruses can cause cancer., Fact2: Cancer is an example of a mutation in cells., Question: What can mutate cells? (A) Allergies (B) water (C) fruits (D) flow of electrons (E) vegetables (F) harmful substances (G) rays or beams (H) some viruses
[EX A]: H

[EX Q]: Fact1: harming an animal species has a negative impact on the population size of that species, Fact2: Sometimes hunting can impact animal populations., Question: What does hunting do to a species? (A) Plant growth is reduced (B) Decreases population (C) protect them (D) cause their death (E) Creates demand for the species (F) Strengthens the species (G) massive damage (H) Increases population
[EX A]: B

[EX Q]: Fact1: a thermal insulator slows the transfer of heat, Fact2: Heat is a measurement of transferable energy., Question: A thermal insulator slows the transfer of (A) moisture (B) energy. (C) voltage (D) sunlight (E) warmth (F) photons (G) matter (H) air
[EX A]:
B