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: *** and *** are necessary for ____ to ***.  (A) plants (B) animals (C) both plants and animals (D) nonliving thing.
Example Output: E.

Example Input: Question: All of the following are ways plants disperse their seeds except ___.  (A) hibernating (B) animals (C) wind (D) dropping seed.
Example Output: A.

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