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: 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
[A]: E


[Q]: Fact1: the looseness of soil has a positive impact on a plant 's roots' growth in that soil, Fact2: Roots gather plant nutrients., Question: What does looseness of soil have an impact on? (A) age of the plant (B) viability of plant (C) important habitats (D) bloom time (E) climate (F) water retention (G) Plants growth (H) genetic diversity
[A]: G


[Q]: Fact1: the movement of tectonic plates causes volcanic eruptions, Fact2: The San Andreas is a "transform fault" that marks the boundary between two tectonic plates --  the North American and the Pacific., Question: What causes volcanic eruptions? (A) a hemisphere is tilted away from the sun (B) high-mass stars collapsing (C) tectonic plates being pushed together (D) Two things found in Florida (E) Two things that come together in San Andreas (F) Two things found in Washington DC (G) Sudden shaking of the ground. (H) Two things found in Manhattan
[A]:
E