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: The more tightly packed the particles inside the material are, the more dense we say they are.
 Question: Sasha is throwing bottles into the lake. Some bottles are filled with sand, and some only have a tiny bit of sand in them. The bottles with a tiny bit of sand will sink last because they are 
 Choices: A)less dense 
B)more dense
[EX A]: less dense

[EX Q]: Paragraph: As you go farther from the nucleus of an atom, the electron levels have more and more energy.
 Question: Eric pushes an electron closer to the nucleus of an atom. The electron _____ energy. 
 Choices: A)loses 
B)gains
[EX A]: gains

[EX Q]: 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
[EX A]:
increase