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 Q]: 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 A]: B

[EX Q]: A dragonfly develops through incomplete metamorphosis. Which stages does the dragonfly's life cycle include?  
 (A) egg and larva (B) egg and nymph (C) larva and pupa (D) larva and nymph
[EX A]: B

[EX Q]: Which part of a DNA molecule represents encoded information?  
 (A) phosphate (B) sugar (C) guanine (D) hydrogen bond
[EX A]:
C