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: darkness has a negative impact on photosynthesis, Fact2: Light is necessary for photosynthesis, a process that produces oxygen., Question: Darkness has a negative impact on which process of a plant? (A) slow and inefficient (B) chemical changes (C) circulatory systems (D) most organisms (E) fossil fuels (F) Abnormal cell growth (G) deoxyribonucleic acid (H) Oxygen production
[A]: H


[Q]: Fact1: Bivalves feed on plankton and nonliving organic matter., Fact2: Mussels are bivalve mollusks., Question: What feeds on plankton and nonliving organic matter? (A) barnacles (B) mollusks (C) animals (D) the Sun (E) sharks (F) graptolites (G) bacteria (H) dogs
[A]: B


[Q]: Fact1: contact between rocks over long periods of time causes rocks to smooth, Fact2: Underfoot, loose rocks make footing perilous, while smooth marblelike stones make it slippery., Question: contact between rocks over long periods of time causes rocks to be what? (A) erosion (B) Loose (C) slippery (D) loose soil (E) homogenous (F) coiled (G) imbalanced (H) threatened
[A]:
C