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: For a given medium such as air, sound has a slower speed at lower temperatures.
Question: If Mary is blowing an air horn underwater and she lowers the temperature of the water, what will happen to the speed of the sound waves generated by the air horn?
Choices: A)increase
B)decrease
decrease

Paragraph: Objects with greater mass have a stronger force of gravity.
Question: Greta lost weight after eating food. Her force of gravity
Choices: A)increased
B)decreased
decreased

Paragraph: An object has greater momentum if it has greater mass, greater velocity, or both.
Question: If an eighteen wheeler and a small wagon are both rolling down a small hill, which has the most momentum?
Choices: A)small wagon
B)eighteen wheeler
eighteen wheeler