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: Protozoa can be classified on the basis of how they move., Fact2: Paramecium are protozoa, single celled animals., Question: What can be classified on the basis of how they move? (A) each species (B) aquatic organisms (C) reptiles ancestral to mammals (D) single celled organisms (E) microbes and mussels (F) trailers and boats (G) How fast a vehicle is going (H) melanin content
[A]: D

[Q]: Fact1: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Supersaturation is inferred to be a common state for atmospheric haze particles., Question: What decreases the temperature by blocking the Sun? (A) cilia (B) the Sun (C) the wind (D) haze (E) ice (F) fat (G) rain (H) acids
[A]: D

[Q]: Fact1: electrical current running through a wire causes that wire to heat up, Fact2: Copper is used in wires and such., Question: What can run through copper, causing it to heat up? (A) activation energy (B) oxygen (C) water (D) an electron lens (E) electromagnetic energy (F) ice (G) hydrogen and oxygen (H) electrical current
[A]:
H