Detailed Instructions: 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).
Problem:Paragraph: Warm air is less dense than cool air, so it rises higher in the troposphere.
 Question: Warm air is able to fill more space than cold air because it is 
 Choices: A)more dense 
B)less dense
Solution:
less dense