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) Sunlight (B) Water (C) Starch (D) Chlorophyl.
Example Output: E.

Example Input: Question: To safely *** an *** using ***, what should students always do?  (A) Work in large groups. (B) Wear safety goggles. (C) Wear short sleeves. (D) Keep a window open.
Example Output: E.

Example Input: Question: *** *** *** woodpecker population *** *** forest *** *** likely *** affected *** *** housing development *** built *** *** area?  (A) They would produce more offspring. (B) They would change the color of their feathers. (C) They would experience a decrease in available food. (D) They would experience a decrease in competition.
Example Output:
C.