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:
The parts of plants that make seeds are the  
 (A) roots. (B) stems. (C) flowers. (D) leaves.

Ex Output:
C


Ex Input:
Which of these cycles takes 24 hours?  
 (A) Earth rotating on its axis (B) Earth revolving around the Sun (C) the Moon rotating on its axis (D) the Moon revolving around Earth

Ex Output:
A


Ex Input:
An automobile engine transforms chemical energy of fuel primarily into  
 (A) electrical energy and light energy. (B) electrical energy and mechanical energy. (C) thermal energy and light energy. (D) thermal energy and mechanical energy.

Ex Output:

D