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:
Which substance do all living things require to survive?  
 (A) blood (B) water (C) carbon dioxide (D) organic soil

Ex Output:
B


Ex Input:
Which of the following would be more likely to pollute a river?  
 (A) allowing beavers to build a dam (B) spreading fertilizer near the river (C) mowing the grass on the river bank (D) fishing from a bridge over the river

Ex Output:
B


Ex Input:
Which is considered a property of soil?  
 (A) streak (B) fracture (C) texture (D) luster

Ex Output:

C