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.

Example Input: A radio station broadcasting across a large area is experiencing thunderstorms. How will the radio waves from the station be affected?  
 (A) wavelength will be increased (B) amplitude will be unchanged (C) frequency will be distorted (D) speed will be decreased
Example Output: C

Example Input: Which of the following properties best describes a material's ability to resist scratching?  
 (A) weight (B) flexibility (C) length (D) hardness
Example Output: D

Example Input: The class puts the planters by the window so that the plants can get more sunlight. How do the tomato plants use sunlight?  
 (A) to make sugar in the leaves (B) to use starch from the stems (C) to move water to the flowers (D) to get nutrients through the roots
Example Output:
A