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: erosion causes a river to become deeper and wider, Fact2: Weathering and erosion continue to shape it today., Question: Weathering causes what to become deeper and wider? (A) a landslide (B) Sediment (C) a mountain (D) a volcano (E) soils (F) rock (G) flooding (H) a river
[EX A]: H

[EX 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
[EX A]: A

[EX Q]: Fact1: a solar panel converts sunlight into electricity, Fact2: Electricity Cars that operate using electricity are the cleanest cars on the market., Question: Some cars can now be powered by  (A) wind (B) Solar energy (C) fusion power plants (D) brain waves (E) gravitational waves (F) engines (G) sunlight (H) energy
[EX A]:
G