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.

Which change in the environment would have a negative effect on the survival of a species in an ecosystem?
(A) increase in the population of prey (B) introduction of a competing species (C) decrease in the population of predators (D) increase in genetic diversity of the species
B