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 falls away, allowing the rocket to go 
 Choices: A)higher 
B)lower

A: higher
****
Q: Paragraph: The larger the animal, the heavier the exoskeleton, making movement more difficult.
 Question: Harry has a pet walrus. Jim has a pet parrot. Whose pet has a lighter exoskeleton? 
 Choices: A)Jim 
B)Harry

A: Jim
****
Q: Paragraph: The faster the clicks of a Geiger counter occur, the higher the level of radiation.
 Question: A Geiger counter is clicking away, and suddenly slows down quite a lot. The counter is telling people that the level of radiation is 
 Choices: A)lower 
B)higher

A:
lower
****