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 would be a safe practice to exercise during laboratory investigations?
(A) using open flames to heat all materials (B) keeping your cell phone on the laboratory countertop (C) knowing where your instructor/laboratory leader is at all times (D) removing your safety glasses when moving from station to station
[A]: C

[Q]: Which of the following statements best explains how the decomposition of plant and animal matter helps to form rich soils?
(A) Decomposition adds silt to soil. (B) Decomposition adds water to soil. (C) Decomposition adds oxygen to soil. (D) Decomposition adds nutrients to soil.
[A]: D

[Q]: Which cell function is most directly dependent on the cytoskeleton?
(A) transport of material inside the cell (B) response of the cell to external pathogens (C) storage of energy in stable long-term forms (D) direction of cellular activity
[A]:
A