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: Flagella help prokaryotes move., Fact2: Most prokaryotes are unicellular., Question: What helps unicellular organisms move? (A) evaporation (B) bacteria (C) heat energy (D) glucose (E) sweating (F) flagella (G) legs (H) blood
[EX A]: F

[EX Q]: Fact1: melting means changing from a solid into a liquid by adding heat energy, Fact2: When a substance melts, it changes phase from a solid to a liquid by the application of heat., Question: What can be done to a solid by adding heat energy? (A) massive damage (B) phasing the bubbles (C) It expands (D) cooling the center (E) Evaporation (F) changing the phase (G) removing the air (H) Water expanding
[EX A]: F

[EX Q]: Fact1: rain causes erosion, Fact2: Erosion is the breaking apart and moving of rocks and soil., Question: Rain causes the breaking apart and moving of rocks and what? (A) abrasion (B) soil (C) sand (D) reservoirs (E) earth (F) broken (G) ground (H) Roads
[EX A]:
B