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 Input:
Question: The surface of the *** is made up of  (A) craters, highlands, and flat areas (B) swirling gases (C) large bodies of water (D) a mixture of gases and wate.

Ex Output:
E.


Ex Input:
Question: What will most likely happen to an igneous rock that has been eroded and deposited at the bottom of a lake?  (A) It will never change. (B) It will change into a sedimentary rock. (C) It will change into a bigger igneous rock. (D) It will change into a metamorphic rock.

Ex Output:
B.


Ex Input:
Question: A company plants trees on a bare hillside. Which of these is the BEST reason for planting the trees?  (A) The trees provide oxygen for the soil. (B) The trees prevent soil from washing away. (C) The trees make shade for animals living there. (D) The trees cause animals to move to other places.

Ex Output:

B.