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).

[EX Q]: Paragraph: If we have two materials with the same volume, the material with a higher mass will be more dense.
 Question: Jake pours syrup into one cup, then pours water into another, both in equal amounts. Jack can know that the syrup is the less dense of the fluids because it has 
 Choices: A)more mass 
B)less mass
[EX A]: less mass

[EX Q]: Paragraph: More recently, the death rate has fallen because of the availability of more food and medical advances.
 Question: When the villagers are living longer, the food source is likely 
 Choices: A)great 
B)small
[EX A]: great

[EX Q]: Paragraph: If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up.
 Question: If greenhouse gases in the atmosphere were to be doubled, Earth will become 
 Choices: A)cooler 
B)warmer
[EX A]:
warmer