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: staying warm has a positive impact on an animal 's survival, Fact2: With a thick fur coat and 4 inches of fat a bear stays warm., Question: What has a positive impact on an animal's survival? (A) four limbs (B) sensory neurons (C) low water availability (D) fur and fat (E) loss of food (F) heat energy (G) hormones (H) destruction of habitat
[A]: D

[Q]: Fact1: darkness has a negative impact on photosynthesis, Fact2: Light is necessary for photosynthesis, a process that produces oxygen., Question: Darkness has a negative impact on which process of a plant? (A) slow and inefficient (B) chemical changes (C) circulatory systems (D) most organisms (E) fossil fuels (F) Abnormal cell growth (G) deoxyribonucleic acid (H) Oxygen production
[A]: H

[Q]: Fact1: Energy enters ecosystems in the form of sunlight or chemical compounds., Fact2: Biomes are global ecosystems., Question: Where does energy enter into in the form of sunlight and chemical compounds? (A) sun (B) science lab (C) biomes (D) orchids (E) photons (F) deserts (G) black hole (H) trees
[A]:
C