Teacher: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).
Teacher: Now, understand the problem? Solve this instance: Paragraph: Warm air is less dense than cool air, so it rises higher in the troposphere.
 Question: If Mona heats up the air she is putting into her weather balloon, what will happen to the height that it can rise into the troposphere? 
 Choices: A)increase 
B)decrease
Student:
increase