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'.

Q: Question: Roger Bacon is credited for developing the *** ***. His *** of which of these was most useful for this development?  (A) Light (B) Sound (C) Gravity (D) Electricit.

A: E.
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Q: Question: Television provides some ***. What is one way that *** has *** ***?  (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.

A: C.
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Q: Question: Which statement is a *** of ***?  (A) Summers in Tucson are hot and dry. (B) Winters in Flagstaff are cold and snowy. (C) The temperature is 55Â° F in Winslow today. (D) The Sun will set in Yuma today at 6:45 p.m.

A:
E.
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