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: *** *** *** 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.
Example Output: B.

Example Input: Question: Mount St. Helens is part of a volcanic chain that slowly formed on Earth where __________.  (A) continental plates collided (B) oceanic plates pulled apart (C) a continental and an oceanic plate pulled apart (D) a continental and an oceanic plate collide.
Example Output: D.

Example Input: Question: A company that makes *** started using a *** *** instead of ***. The *** *** will *** *** than ***. What is the most likely *** of the *** material?  (A) The new material will keep people safe. (B) The new material will keep pets contained. (C) The new material can make a yard attractive. (D) The new material can save money on replacements.
Example Output:
E.