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: Which characteristic of a *** is an acquired *** due to *** ***?  (A) cleaning its ears (B) sleeping on a chair (C) sharpening its claws (D) meowing when it is hungr.
[EX A]: E.

[EX Q]: Question: Samuel investigated the effect of temperature on the growth of snapdragons. He recorded the results from the *** and found that snapdragons do *** *** well in low temperatures. What is the *** of this *** in the *** process?  (A) It helps to organize the data. (B) It helps to evaluate the hypothesis. (C) It helps to prepare for an investigation. (D) It helps to collect information from observations.
[EX A]: E.

[EX Q]: Question: Which substance is usually *** in nature as a ***, ***, and ***?  (A) water (B) rock (C) metal (D) glas.
[EX A]:
E.