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]: Some plant species are more tolerant of acidic soil than others. The tolerant species are favored in areas affected by which consequence of human activity?
(A) mixing of pollutants with rain (B) erosion of topsoil by clearcutting (C) runoff of fertilizer used in farming (D) thinning of the atmospheric ozone layer
[A]: A

[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]: A worker needs to load a heavy box onto a truck. The worker uses a ramp to move the box because the ramp
(A) increases the weight of the box. (B) reduces the gravitational force on the box. (C) increases the amount of friction on the box. (D) reduces the amount of force applied to the box.
[A]:
D