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: What is the *** that *** *** to *** ***?  (A) photosynthesis (B) respiration (C) digestion (D) propagatio.
[A]: E.


[Q]: Question: *** effect *** *** *** *** ****** *** predators *** *** *** ***  (A) They increase the mutations in a population. (B) They prevent a population from becoming extinct. (C) They increase the rate of population growth. (D) They can limit the growth of the population.
[A]: E.


[Q]: Question: *** *** are *** that *** in a *** *** *** that is alternately *** and *** by ***. This type of *** *** *** *** and many *** of ***. The *** *** *** in this *** is that it can  (A) pry open shells. (B) produce a tiny light. (C) move quickly along the sea bottom. (D) survive the pressurized atmosphere of deep water.
[A]:
E.