Given the task definition and input, reply with output. 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).

Paragraph: The density of the atmosphere decreases with an increase in the height above sea level (altitude).
 Question: What would happen to the atmosphere as Jim climbed lower down a mountain? 
 Choices: A)it would become less dense 
B)it would become more dense
it would become more dense