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: gases released during the use of fossil fuels causes global warming, Fact2: Oil is a fossil fuel., Question: Gases released during the use of oil causes what? (A) global warming (B) better weather on the earth (C) colder weather (D) less oily air (E) The atmosphere (F) flooding (G) Temperature (H) cleaner air to breathe

A: A
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Q: Fact1: Roundworms may be free-living or parasitic., Fact2: Roundworms make up the roundworm phylum, Nematoda., Question: What can the phylum Nematoda be? (A) dangerous (B) parasitic (C) horses (D) meiosis (E) more abundant (F) graptolites (G) homogenous (H) phytoplankton

A: B
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Q: Fact1: Rivers are usually larger than streams., Fact2: Snows melt and replenish the rivers and lakes., Question: Streams are smaller than something made from what? (A) Metling snow (B) body water (C) an organism's body (D) Sediment (E) fossil fuels (F) Weathering (G) erosion (H) aqueous solution

A:
A
****