You will be given a definition of a task first, then some input of the task.
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").

Fact1: All life relies on a relatively narrow range of pH, or acidity., Fact2: All organisms have a life-span., Question: Organisms rely on a relatively narrow range of what? (A) Decibels (B) water (C) food (D) relativity (E) acidity (F) spectrum (G) balance (H) Light
Output:
E