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: This is also called diffusion, and the process is much faster in gases than in liquids, because the particles in gases are further apart.
 Question: Diffusion occurs slower in 
 Choices: A)water 
B)oxygen.
[EX A]: water

[EX Q]: Paragraph: Better farming techniques and machines increased the food supply and the distribution of food.
 Question: Jeff noticed the food supply changed over time in his city. The advent of farming machines likely caused the food supply to 
 Choices: A)decrease 
B)increase
[EX A]:
increase