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: Seismic waves occur as a result of an earthquake. Which statement describes a wave property that makes it possible for scientists to locate the source of an earthquake?
(A) The wavelength of a wave is measured from crest to crest. (B) Waves travel uniformly outward from the wave source. (C) The frequency of waves varies in different mediums. (D) Waves move at the same speed in different materials.

A: B
****
Q: What is an environmental threat posed by oil and gas acquisition and transport that is not posed by the acquisition and transport of the energy resources uranium, and wood?
(A) habitat change (B) vehicle pollution (C) pipeline leaks (D) soil compaction and loss

A: C
****
Q: Water that is used to cool nuclear power plants can be released into water bodies, causing an area called a thermal plume. A thermal plume can be 12-18C warmer than surrounding waters. Although some fish may be attracted to the warmer water, other organisms may not be able to survive. Government officials order a study to determine the effects of a thermal plume in a water body near a nuclear power plant in North Carolina. Which factor most related to temperature should the study focus on in order to determine whether the thermal plume is damaging the health of the water system?
(A) pH (B) dissolved oxygen (C) nutrient concentration (D) turbidity

A:
B
****