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 movement of soil by wind or water is called  (A) condensation (B) evaporation (C) erosion (D) friction.

Ex Output:
C.


Ex Input:
Question: *** *** *** *** *** ****** ****** ****** *** *** *** *** *** ***  (A) records from history. (B) natural motions of the sun. (C) natural motions of the Earth. (D) natural motion of the moon.

Ex Output:
E.


Ex Input:
Question: The *** *** *** VERY *** through ***, which is __________.  (A) a slow erosion due to glacial movements over land (B) the slow movement of lava flows during a volcanic eruption (C) soil moving slowly downhill due to gravity (D) the slow process of wind weathering landform.

Ex Output:

E.