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.

Input: Consider Input: 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.

Output: B

Input: Consider Input: Which of these will most likely harm a habitat?
(A) planting trees (B) water pollution (C) rainfall (D) sunlight

Output: B

Input: Consider Input: Which rankings of trees would most likely useful in a scientific study of fruit production in apple trees?
(A) date of flowering and the fruit yield (B) fruit yield and taste of the fruit (C) taste of the fruit and smell of the flower (D) date of flowering and smell of the flower
Output: A