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: *** *** *** following items *** *** wrecking yard operates *** *** help *** *** electromagnet?  (A) dump truck (B) crane to pick up, haul, and drop cars (C) fence that surrounds the wrecking yard (D) dumpster for leftover part.
[A]: B.


[Q]: Question: *** *** are *** from *** *** in a *** center. Which of the *** is the *** *** the *** *** *** *** the *** *** from the *** cans?  (A) sort the cans by size (B) put the cans in water (C) cool the cans to a low temperature (D) put the cans under an electromagne.
[A]: E.


[Q]: Question: Valerie pumps her super squirt gun and squirts her friend. At which point is the amount of potential energy greatest?  (A) As the water almost reaches her friend (B) When the squirt gun is being pumped (C) Just before she squirts her friend (D) As the water first leaves the squirt gu.
[A]:
C.