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: 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

A: F
****
Q: Fact1: Plants that shed their leaves seasonally each year are called deciduous plants., Fact2: Shade trees can be deciduous., Question: What can shed their leaves? (A) rabbit (B) Power plants (C) insects (D) swamp vegetation (E) mammals (F) Shade trees (G) animals (H) Most plants

A: F
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Q: Fact1: increasing heat causes thermal expansion, Fact2: Heat is caused by molecules moving., Question: What causes causes thermal expansion? (A) molecules moving (B) kinetic energy (C) Electrical energy (D) Evaporation (E) molecules stopping (F) sunlight (G) molecules slowing down (H) molecules standing still

A:
A
****