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: More advanced farming practices allowed a single farmer to grow food for many more people.
 Question: John was studying the history of agriculture for his master's project. He noticed as the methods of farming became more advanced, the amount of food became 
 Choices: A)Larger 
B)Smaller
Larger

Paragraph: Many of the worlds people live with water scarcity, and that percentage will increase as populations increase and climate changes.
 Question: John's town used to have little water, back when there were several thousand people. However, now that the town holds only a few hundred people, the water availability is 
 Choices: A)scarce 
B)plentiful
plentiful

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

less dense