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]: Research in which of these areas has the greatest impact on the environment?  
 (A) irradiating food (B) organic fertilizers (C) bacteria to clean up oil spills (D) developing larger, sweeter strawberries
[EX A]: C

[EX Q]: A student is designing a model of the solar system and writing a report. She is trying to be as accurate as possible. Which statement should she include in her report?  
 (A) The distance between the Sun and Earth is measured in light years. (B) Jupiter and Uranus are considered to be terrestrial planets. (C) The asteroid belt is located between Jupiter and Saturn. (D) The orbit of Mars is similar to the orbit of Saturn.
[EX A]: D

[EX Q]: Which part of a dandelion plant takes in minerals and water?  
 (A) flower (B) leaf (C) root (D) stem
[EX A]:
C