TASK DEFINITION: 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.
PROBLEM: If a student playing the drums hits the drums with greater force, the sound would be  
 (A) quieter. (B) louder. (C) lower in pitch. (D) higher in pitch.

SOLUTION: B

PROBLEM: 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

SOLUTION: B

PROBLEM: During its lifetime, a star will evolve through several stages. In which stage does a star spend most of its life?  
 (A) red giant (B) red dwarf (C) white dwarf (D) main sequence

SOLUTION:
D