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: seeing requires light, Fact2: Sight is the mere ability to see, and the eye's responses to light shining into it., Question: What do eyes require? (A) a form of oxygen (B) Light shining into it (C) Exposure to oxygen and water (D) A dark environment (E) Contact lenses (F) melanin amount (G) tissue made of chondrocytes (H) Glasses
[EX A]: B

[EX Q]: Fact1: Organisms cluster around hydrothermal vents in the ocean floor., Fact2: Background Hot water vents form inside cracks in the ocean floor., Question: Organisms cluster around hot water inside cracks where? (A) loose soil (B) ocean floor (C) food and shelter (D) tectonic plates (E) the ground (F) allow growth (G) Absorb light (H) survive
[EX A]: B

[EX Q]: Fact1: if a tree falls then sunlight becomes available to the surrounding plants, Fact2: Oak trees are found throughout., Question: what falls making sunlight available to surrounding plants? (A) LEDs (B) grass (C) elms (D) oak (E) pine (F) clouds (G) palm (H) acorns
[EX A]:
D