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: All life relies on a relatively narrow range of pH, or acidity., Fact2: Human life is dependent life., Question: what relies on a relatively narrow range of acidity? (A) gravity (B) mammals (C) animals (D) trees (E) humans (F) density (G) volume (H) potatoes
[EX A]: E

[EX Q]: Fact1: safety goggles are used for protecting the eyes during experiments, Fact2: Firm plastic eyeglasses or goggles are better., Question: What protects the eyes during experiments? (A) magnesium (B) Chemicals (C) Vibrissae (D) Type O (E) Rolex (F) plastic (G) water (H) wind
[EX A]: F

[EX Q]: Fact1: electricity is used as an energy source by electrical devices, Fact2: Of course, computers are electronic devices, and as such, they deal in electrical terms., Question: Electricity is used for energy by what? (A) cucumbers (B) cells (C) computers (D) humans (E) minerals (F) human computers (G) consumers (H) adding heat
[EX A]:
C