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).

[EX Q]: Question: After testing the ability of aluminum, wood, and plastic to conduct electricity, a student would conclude that ___.  (A) aluminum is a good conductor (B) wood and plastic are good conductors (C) aluminum is a good insulator (D) wood is a good conducto?
[EX A]: A.

[EX Q]: Question: Which geographic region of Virginia has the least impact on the water quality of Chesapeake Bay?  (A) Coastal Plain (B) Piedmont (C) Blue Ridge Mountains (D) Appalachian Platea?
[EX A]: C.

[EX Q]: Question: A student is holding a ball. How can the student increase the kinetic energy of the ball?  (A) warm it in sunlight (B) throw it (C) remove the surface of the ball so that the energy is released (D) expose it to fir?
[EX A]:
B.