You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Ex Input:
What is a main feature of plains?
(A) a flat, level surface (B) a high, steep peak (C) a low, shallow basin (D) a gentle, gradual slope

Ex Output:
A

Ex Input:
A student is investigating which type of soil is best for growing tomato plants from seeds. The student plants four tomato seeds in each of three different containers of soil. Which step of the procedure would help the student get the most reliable results?
(A) Place one container in a dark room. (B) Use different types of tomato seeds. (C) Change only the soil type in each container. (D) Water each container with a different amount of water.

Ex Output:
C

Ex Input:
Which of these animals has a young form that looks the most like the adult form?
(A) moth (B) human (C) frog (D) butterfly

Ex Output:
B