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: In a genetics investigation, students used two red straws to represent male parent DNA. They used two green straws to represent female parent DNA. The offspring in this activity are best represented by
(A) either one red straw or one green straw. (B) two green straws. (C) two red straws. (D) one red straw and one green straw.
Output:
D