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: Researchers are developing new types of crop plants with desirable characteristics such as disease resistance and drought tolerance. Crossing plants so that the next generation will express desirable traits is best described as  
 (A) selective breeding. (B) natural selection. (C) genetic engineering. (D) gene sequencing.

Output: A


Input: Consider Input: Which step will most likely ensure that the results of an investigation are valid?  
 (A) using a computer to graph results (B) verifying that results match the original hypothesis (C) comparing the results with those of other scientists (D) eliminating any results that appear to be abnormal

Output: C


Input: Consider Input: Changes to abiotic factors in an environment can impact biotic factors. Which statement is the BEST example of this situation?  
 (A) Heavy rainfall increases soil erosion. (B) Melting glaciers cause sea levels to rise. (C) Cold temperatures cause rocks to weather. (D) Drought conditions increase competition among consumers.


Output: D