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: A student puts *** *** *** in the same *** and *** of ***. She gives them the same *** of water. She puts one of these *** *** a *** *** and the other in a *** ***. This experiment *** how the *** *** to  (A) light (B) air (C) water (D) soi.
[A]: E.


[Q]: Question: A simple machine that helps move a flag up a flagpole is  (A) a bar magnet (B) an inclined plane (C) a pulley (D) a leve.
[A]: C.


[Q]: Question: Diatoms are *** that *** *** through the process of ***. *** are an *** of a *** that is ***.  (A) visible to the naked eye (B) disease-causing in humans (C) a primary producer (D) responsible for decompositio.
[A]:
E.