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.

Ex Input:
Which type of air mass forms over the ocean near the equator?  
 (A) moist and warm (B) moist and cool (C) dry and warm (D) dry and cool

Ex Output:
A


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

Ex Output:
D


Ex Input:
The sound, light, and heat that a firecracker produces are originally stored as which type of energy?  
 (A) nuclear energy (B) chemical energy (C) electrical energy (D) mechanical energy

Ex Output:

B