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'.

Question: Which term best describes the moon?  (A) the moon orbits the sun (B) The moon is a satellite of the Earth (C) The moon gives off its own light (D) the moon orbits the Earth once a yea.
B.

Question: *** *** *** *** *** result *** *** decrease *** *** polar bear population *** *** ***?  (A) An increase in the amount of grass (B) An increase in the fish population (C) A decrease in the fish population (D) A decrease in the human populatio.
C.

Question: The ***'s *** *** 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.

E.