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: gravity causes objects that have mass to be pulled down on a planet, Fact2: Rocks have mass., Question: What does gravity cause to be pulled down on a planet? (A) matter (B) heat (C) earth (D) solutes (E) oceans (F) Rocks (G) people (H) Lift

A: F
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Q: Fact1: Freshwater biomes have water that contains little or no salt., Fact2: Biomes are global ecosystems., Question: what is freshwater habitats that contain little or no salt? (A) Animal survival (B) allow growth (C) weathering (D) atmosphere (E) loose soil (F) ecosystems (G) salt and water. (H) oceans

A: F
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Q: Fact1: erosion causes a river to become deeper and wider, Fact2: Canyon formed as a consequence of river erosion., Question: What are formed by erosion? (A) mountains (B) hills (C) canyons (D) Sediment (E) loose soil (F) rocks (G) soils (H) streams

A:
C
****