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.

[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
[A]: B


[Q]: Use of nuclear fuel would most likely reduce human contributions to which environmental problem?  
 (A) ozone thinning (B) landfill creation (C) shoreline erosion (D) greenhouse heating
[A]: D


[Q]: A ball is thrown up into the air. Which force causes the ball to fall to the ground?  
 (A) friction (B) gravity (C) magnetism (D) electricity
[A]:
B