Teacher: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.
Teacher: Now, understand the problem? Solve this instance: How does the buying and selling of a popular species of rainforest animal as pets have a negative effect on the rainforest ecosystem?
(A) The rate of photosynthesis may decrease. (B) There is a probability of genetic variability. (C) The number of symbiotic relationships increases. (D) It could lead to the potential extinction of those animals.
Student:
D