In this subtask, you will answer a simple science question. Please indicate the correct answer. If you're not sure about the answer, choose the last option "I don't know". Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. The "A"-"D" responses correspond to the answer options mentioned in the input. There is a 5th option "E" which should be used for questions for which you're not sure about the answer (e.g., when the questions do not provide enough information to answer).
One example: Question: When a guitar string is plucked, sound is produced by  (A) the size of the guitar. (B) the metal on the guitar. (C) the wood on the guitar. (D) the vibrations of the string.
Solution is here: D.
Explanation: We know that the vibrations of the string produces sound in a guitar. So, the correct answer has to be "D".

Now, solve this: Question: Which of the following is NOT true in any particular environment?  (A) Some kinds of plants and animals survive well. (B) Some kinds of plants and animals do not survive well. (C) Some kinds of plants and animals cannot survive. (D) Some plants and animals will always survive?
Solution:
D.