Definition: 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: When taken to a new habitat, non-native plants often threaten native plants of the new habitat. Why do non-native plants threaten native plants?
(A) Non-native plants are able to mutate rapidly. (B) Non-native plants cause native animals to relocate. (C) Non-native plants are able to be used for medicine. (D) Non-native plants compete with native plants for resources.
Output:
D