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]: Which of the following is the main role of flowers found on most flowering plants?  
 (A) to take in air (B) to produce seeds (C) to absorb nutrients (D) to protect the stem
[A]: B


[Q]: What is the name of the product formed from the reaction shown below? 4Fe(III) + 3O_{2} -> 2Fe_{2}O_{3}  
 (A) iron (II) oxide (B) iron (III) oxide (C) oxygen ferrite (D) diferrous trioxide
[A]: B


[Q]: Read the information about Alice's science project then answer the question. Alice needed to design a science project. She decided that she wanted to focus her project on how an earthworm's behavior helps it survive. Alice wrote down four ideas about earthworm behavior that she wanted to test. Which idea can be tested experimentally?  
 (A) Earthworms like the taste of dirt better than sand. (B) Earthworms are happier in black dirt than red dirt. (C) Earthworms exist to decompose decaying materials. (D) Earthworms will move away from direct light sources.
[A]:
D