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: If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.
 Question: Penny added salt to her cup of water and noticed the water got _____. 
 Choices: A)thicker 
B)thinner
thicker

Paragraph: The hotter a main sequence star is, the brighter it is.
 Question: Compared to the Sun, which is an average star, would CFBDSIR 1458, the coldest star, be 
 Choices: A)brighter than the Sun 
B)dimmer than the Sun?
dimmer than the Sun?

Paragraph: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.
 Question: David is getting ready to fly into space on a rocket. As the rocket shoots upwards, part of the mass attaches, allowing the rocket to go 
 Choices: A)higher 
B)lower
lower