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: *** long *** enable them to  (A) reach food and water (B) breathe (C) move quickly (D) fight predator.
[EX A]: E.

[EX Q]: Question: *** *** *** *** *** *** *** *** mass?  (A) Chicken (B) Puppy (C) Lizard (D) Hors.
[EX A]: E.

[EX Q]: Question: A scientist put several different plants in a sealed container. Every hour, she checked the *** in the *** to see if it ***d. How did the *** in the *** most likely ***?  (A) The amount of oxygen increased. (B) The amount of oxygen decreased. (C) The oxygen was transformed into water. (D) The oxygen was transformed into carbon dioxide.
[EX A]:
E.