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: treating water is used to remove harmful substances before drinking, Fact2: For a scientist, water is H2O whether from the Ganga or a tap., Question: Why do we generally treat H2O? (A) to add water to crops (B) hydration (C) vaporization (D) to water the garden (E) to drink it (F) looseness (G) to track it (H) evaporation
A:
E