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: Biodiversity increases the productivity and stability of ecosystems., Fact2: An ecosystem includes the organisms and their habitat., Question: what does biodiversity increase the productivity and stability of? (A) density (B) the looseness of soil (C) water vapor (D) the environment (E) h2o (F) swamp vegetation (G) biological diversity (H) organisms and their habitat
[EX A]: H

[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: a rubber band snapping causes the particles in the rubber band to vibrate, Fact2: Sound travels through matter by vibration., Question: What type of wave results from snapping a rubber band? (A) sound (B) snap in half (C) electromagnetic (D) energy (E) Energy. (F) ultraviolet (G) heat (H) kinetic
[EX A]:
A