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: a greenhouse is used to protect plants by keeping them warm, Fact2: Flower size varies by plant., Question: How does a greenhouse protect flowers? (A) keeps them away from the sun (B) keeps them warm (C) keeps them out of soil (D) an external framework (E) it needs them (F) keeps them cold (G) rays or beams (H) by indirect light
[A]: B

[Q]: Fact1: cross-pollination increases genetic diversity, Fact2: Evolution requires genetic diversity., Question: What does evolution require? (A) Time and energy (B) Plant reproduction (C) cross-pollination (D) Reproduction (E) gene flow (F) coded genes (G) circulatory systems (H) animals with backbones
[A]: C

[Q]: Fact1: a glacier causes mechanical weathering, Fact2: Mechanical weathering happens when things like ice physically break rock apart., Question: What do glaciers do to rocks? (A) break off (B) Turns them into ice (C) Regrows it (D) Creates more rocks (E) Dries them out (F) protect them (G) Breaks them apart (H) cause their death
[A]:
G