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: a prism is used for refracting light, Fact2: Refraction is the bending of light cause by a speed change when it passes through different media., Question: What aspect of light changes when it passes from air into a prism? (A) power (B) seasons (C) speed (D) energy (E) a wave (F) Joules (G) heat (H) unique
[A]: C


[Q]: Fact1: Mollusks have a circulatory system with one or two hearts that pump blood., Fact2: An abalone is a shellfish or mollusk., Question: What has a circulatory system with one or two hearts that pump blood? (A) a fish (B) sharks (C) abalone (D) elephants (E) humans (F) crocodiles (G) giraffes (H) fur seals
[A]: C


[Q]: Fact1: harming an animal species has a negative impact on the population size of that species, Fact2: Pollution is usually harmful to one or more species of animal or plant., Question: What is usually harmful to the population size of a species? (A) Pollution (B) reproduction (C) viruses (D) disease (E) habitat (F) ecosystems (G) influenza (H) deforestation
[A]:
A