In this task, you need to answer basic science questions. For each question, several terms are intentionally masked with ***. This masking can cover very few or many of the question words. Clearly, if masked terms are important, the modified question will be impossible to answer. Please indicate the correct answer with one of the following responses: "A", "B", "C", "D" or "E". While "A"-"D" correspond to the answer options provided in the input, "E" represents "I don't know" for questions that do not provide enough information. Respond via "E" if the question is not answerable. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'.

Example Input: Question: A student puts two identical *** in the same type and amount of soil. She gives them the same amount of water. She puts one of these *** near a sunny window and the other in a *** room. This experiment tests how the *** *** to  (A) light (B) air (C) water (D) soi.
Example Output: A.

Example Input: Question: A simple machine that helps move a flag up a flagpole is  (A) a bar magnet (B) an inclined plane (C) a pulley (D) a leve.
Example Output: C.

Example Input: Question: *** *** *** which of the following to ***?  (A) food and electricity (B) air, food, and shelter (C) water, food, and clothes (D) food, water, and ai.
Example Output:
E.