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]: The teacher heats a pot of water. Once the water reaches 100°C, which point has the water reached?  
 (A) boiling (B) melting (C) freezing (D) evaporating
[A]: A


[Q]: A lunar eclipse occurs when the Moon passes through Earth's shadow. A lunar eclipse can only occur during a  
 (A) full moon. (B) new moon. (C) first quarter moon. (D) last quarter moon.
[A]:
A