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 Q]: Question: *** part *** *** plant takes *** water *** nutrients?  (A) roots (B) stem (C) leaves (D) flowe.
[EX A]: A.

[EX Q]: Question: What is the main source of *** *** on Earth?  (A) fire (B) volcanoes (C) the sun (D) electricit.
[EX A]: C.

[EX Q]: Question: Television provides some benefits. What is one way that *** has helped people?  (A) Television manufacturing uses many toxic chemicals. (B) The ads on television show many popular toys that kids want. (C) Television provides information about current weather conditions. (D) The electricity used to run televisions is one use of natural resources.
[EX A]:
C.