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'.

Ex Input:
Question: *** *** *** following activities *** harmful *** *** environment?  (A) recycling waste (B) conserving water (C) producing waste (D) reducing pollutio.

Ex Output:
C.


Ex Input:
Question: How would the woodpecker population in a forest area most likely be affected if a housing development is built in that 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.

Ex Output:
C.


Ex Input:
Question: Living things need which of the following to survive?  (A) food and electricity (B) air, food, and shelter (C) water, food, and clothes (D) food, water, and ai.

Ex Output:

D.