TASK DEFINITION: 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'.
PROBLEM: Question: *** ***s are *** that live in a *** *** *** that is *** *** and *** by ***. This type of *** contains *** *** and many *** of ***. The *** ***'s *** 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.

SOLUTION: E.

PROBLEM: Question: Which adaptation allows a fish to get oxygen underwater?  (A) fins (B) lungs (C) gills (D) hear.

SOLUTION: C.

PROBLEM: Question: Which of the following units would most likely be used to describe the mass of a horse?  (A) meters (B) centigrams (C) kilograms (D) millimeter.

SOLUTION:
C.