You are given a science question (hard-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:
As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?  
 (A) using heat to burn a log in a fireplace (B) using light to produce sugar in plants (C) a cake that was baked from many ingredients (D) a bottle that was broken into many small pieces

Ex Output:
D


Ex Input:
Clay is watching the weather to prepare for a trip to the beach tomorrow. The forecast predicts that a low-pressure system will move in overnight. Which type of weather can Clay most likely expect in the morning?  
 (A) foggy (B) sunny (C) clear and colder (D) cloudy and rainy

Ex Output:
D


Ex Input:
Submarines have explored many parts of the ocean. As submarines descend, scientists observe that there is an increase in the -  
 (A) amount of light (B) water temperature (C) water pressure (D) types of ocean organisms

Ex Output:

C