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: When a tree suffers from a decreased ability to transport materials within the phloem, what is directly impacted?
(A) volume of water in the xylem (B) flow of necessary nutrients (C) response to environmental factors (D) rate of photosynthesis in leaves

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: A student needs to measure out a precise amount of liquid. What is the best tool for the student to use?
(A) test tube (B) meter stick (C) balance scale (D) graduated cylinder

SOLUTION:
D