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: Electromagnets are used in many *** ***, ***, and simple devices. *** are much more *** than *** *** because unlike *** magnets, electromagnets __________.  (A) come in a variety of sizes (B) have an attractive force (C) have two magnetic poles (D) can be turned on or of.
Example Output: D.

Example Input: Question: A student riding a *** observes that it *** *** on a *** road than on a rough road. This happens because the *** road has  (A) less gravity (B) more gravity (C) less friction (D) more frictio.
Example Output: E.

Example Input: Question: *** reading *** *** barometer rises *** *** air  (A) pressure increases. (B) pressure decreases. (C) speed increases. (D) speed decreases.
Example Output:
A.