instruction:
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'.
question:
Question: When a guitar string is plucked, sound is produced by  (A) the size of the guitar. (B) the metal on the guitar. (C) the wood on the guitar. (D) the vibrations of the string.
answer:
D.


question:
Question: Ellie is growing a vegetable garden. In which season do the plants in Ellie's garden receive the most energy from the Sun for growing?  (A) fall (B) spring (C) summer (D) winte.
answer:
C.


question:
Question: Solar cells absorb *** from the sun. In order to use this *** to power household appliances, solar cells must *** the *** *** to  (A) heat. (B) light. (C) radiation. (D) electricity.
answer:

D.