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 Q]: Question: A group of students was preparing an activity to determine whether certain materials will float or sink when placed on water. *** the experiment started, one student said, I think the sponge will float.? This statement was  (A) a conclusion (B) a fact (C) an observation (D) a predictio.
[EX A]: D.

[EX Q]: Question: *** *** *** *** *** explains *** stems transport water *** *** parts *** *** plant?  (A) through a chemical called chlorophyll (B) by using photosynthesis (C) through a system of tubes (D) by converting water to foo.
[EX A]: C.

[EX Q]: Question: *** *** *** *** *** *** example *** *** chemical change?  (A) clouds forming (B) sugar dissolving (C) water freezing (D) a candle burnin.
[EX A]:
D.