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: All life relies on a relatively narrow range of pH, or acidity., Fact2: All organisms have life cycles., Question: what relies on a relatively narrow range of acidity? (A) organisms (B) carbon (C) animals (D) hydrogen (E) density (F) trees (G) Most plants (H) barnacles
[EX A]: A

[EX Q]: Fact1: acid rain has a negative impact on water quality, Fact2: Sulfur dioxide causes acid rain., Question: What has a negative impact on water quality? (A) Reverse osmosis (B) fossil fuels (C) Fresh water (D) Carbon filter (E) chlorofluorocarbons (F) Sulfur dioxide (G) Pollution (H) harmful substances
[EX A]: F

[EX Q]: Fact1: friction causes the speed of an object to decrease, Fact2: Friction is a Force that opposes motion., Question: If a force that opposes motion is applied to an object, what will happen to its speed? (A) Plant growth is reduced (B) It will decrease (C) It will reach nano-speed (D) It will stay the same (E) kinetic energy (F) It will increase (G) Under 32 degrees (H) supersonic
[EX A]:
B