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).

[Q]: 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
[A]: lower


[Q]: Paragraph: Objects with greater mass have a stronger force of gravity.
 Question: If Mona is comparing an apple and an orange and she determines that the apple has more mass then the orange, which one has a greater force of gravity? 
 Choices: A)apple 
B)orange
[A]: apple


[Q]: Paragraph: For example, more people on the Earth means more people contributing to global warming and pollution.
 Question: What will happen to the levels of pollution on Earth if the population decreases? 
 Choices: A)they will rise 
B)they will fall
[A]:
they will fall