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: Aluminum containers can be melted and made into new products. How will *** *** most likely benefit communities?  (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: One function of the *** of a plant is to  (A) make food for the plant. (B) help the plant reproduce. (C) contain seeds. (D) provide support for the plant.
Example Output: E.

Example Input: Question: Which of the following *** is *** for the ***?  (A) recycling waste (B) conserving water (C) producing waste (D) reducing pollutio.
Example Output:
E.