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 are examples of inherited traits?  
 (A) specific beliefs (B) fingerprints (C) memories (D) nose shape

Ex Output:
D


Ex Input:
Ava conducted an experiment to determine respiratory rates during different activities. She counted the number of breaths per minute. Ava noted that the number of breaths increases as physical activity increases. Why is there an increase in the number of breaths per minute as activity increases?  
 (A) As activity increases, more oxygen is exhaled. (B) As activity increases, breathing becomes more efficient. (C) As activity increases, the oxygen needs of cells increase. (D) As activity increases, the rate of the heart beating increases.

Ex Output:

C