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: Biodiversity increases the productivity and stability of ecosystems., Fact2: Ecotourism, on the other hand, can help to conserve biodiversity., Question: What increases the stability of ecosystems? (A) overpopulation (B) water consumption (C) loose soil (D) Quality of life (E) agriculture (F) deforestation (G) ecotourism (H) trees
[A]: G

[Q]: Fact1: a plants require water for survival, Fact2: Water contains hydrogen and oxygen., Question: What do plants require for their survival? (A) Light (B) Proteins (C) Energy. (D) salinity (E) hydrogen (F) nutrients (G) sunlight (H) food
[A]: E

[Q]: Fact1: a polar bear requires a cold environment, Fact2: Polar bears have two layers of fur for further protection from the cold., Question: Why do polar bears have two layers of fur? (A) 70-75 degrees Fahrenheit (B) Prevent injuries (C) To survive in their environment (D) Amount of melanin (E) To stay cold (F) Ultraviolet shielding (G) protective plates (H) To help them swim faster
[A]:
C