Instructions: 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").
Input: Fact1: transpiration is when water vapor moves from plants into the atmosphere, Fact2: Transpiration occurs as long as stomates are open., Question: what must happen for water vapor to move from plants into the atmosphere? (A) plant must be dead (B) Condensation (C) stomates must be open (D) evaporation (E) cells must be closed (F) must be cloudy (G) Warm air moving into cold air (H) vaporization
Output:
C