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: Some birds fly south *** winter each year. This is an example of  (A) migration (B) hibernation (C) germination (D) evaporation.
Example Output: A.

Example Input: Question: Aluminum containers can be melted and made into new products. How will *** *** most likely *** ***?  (A) People will use less energy. (B) People will drink more soda. (C) People will add less to landfills. (D) People will buy more things in cans.
Example Output: C.

Example Input: Question: *** ***, such as ***, ***, ***, weeks, and *** are *** on the  (A) records from history. (B) natural motions of the sun. (C) natural motions of the Earth. (D) natural motion of the moon.
Example Output:
E.