You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).
Q: Paragraph: Exhaling, or breathing out, decreases the size of the chest, which increases air pressure inside the lungs.
 Question: If Mary is running and race and begins to breathe hard, what happens to the air pressure in her lungs as she expands her chest? 
 Choices: A)increases 
B)decreases
A:
decreases