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 property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature

Ex Output:
B


Ex Input:
Florida has a large supply of phosphate that ancient seas deposited millions of years ago. The phosphate contains the remains of animals that were deposited in layers on the sea floor. Which type of rock did the phosphate become?  
 (A) intrusive igneous (B) extrusive igneous (C) clastic sedimentary (D) organic sedimentary

Ex Output:
D


Ex Input:
The motion of Earth is responsible for several celestial events. Which of the following events is caused by Earth revolving around the sun?  
 (A) the days in a year (B) the hours in a day (C) the changes in the atmosphere of Earth (D) the position of the constellations in space

Ex Output:

A