TASK DEFINITION: In this subtask, you will answer a simple science question. Please indicate the correct answer. If you're not sure about the answer, choose the last option "I don't know". Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. The "A"-"D" responses correspond to the answer options mentioned in the input. There is a 5th option "E" which should be used for questions for which you're not sure about the answer (e.g., when the questions do not provide enough information to answer).
PROBLEM: Question: The movement of soil by wind or water is called  (A) condensation (B) evaporation (C) erosion (D) friction?

SOLUTION: C.

PROBLEM: Question: When is a human considered to have reached the adult stage?  (A) When cells no longer divide (B) When the human has begun to talk (C) When the human has begun to walk (D) When most growth has stoppe?

SOLUTION: D.

PROBLEM: Question: Which statement correctly describes both gases and liquids?  (A) Their shapes stay the same in any container. (B) Their shapes change when they are in different containers. (C) Their volumes stay the same in any container. (D) Their volumes change when they are in different containers?

SOLUTION:
C.