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: All organisms have life cycles., Question: what relies on a relatively narrow range of acidity? (A) organisms (B) carbon (C) animals (D) hydrogen (E) density (F) trees (G) Most plants (H) barnacles
[EX A]: A

[EX Q]: Fact1: bees convert nectar into honey, Fact2: Butterflies feed on nectar produced by flowers., Question: From what part of the plant do bees collect the substance they need to make honey? (A) Fruit (B) a hosta (C) food (D) Leaves (E) keratin (F) Flowers (G) liquids (H) Stem
[EX A]: F

[EX Q]: Fact1: Earthworms are important deposit feeders that help form and enrich soil., Fact2: Earthworms are perhaps the most familiar decomposer., Question: What can help form and enrich soil? (A) Most plants (B) whales (C) the Sun (D) decomposers (E) swamp vegetation (F) shrub beds (G) phytoplankton (H) fossil fuels
[EX A]:
D