You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Sentence: Three spelunkers are exploring a huge canyon. They are all far from one another. Henry can see the headlights from his friends, Betty and Dave. Betty's light appears to be brighter than Dave's. Question: Which of his friends is he closer to?
Betty

Sentence: Two identical cars attempt to accelerate as fast as possible. Question: If one car is empty and one car is full of bricks, which one will accelerate more slowly?
Full car

Sentence: Ellie exercises on her treadmill each day. One day she sets the treadmill up to be flat and runs on it for a set amount of time. The next day she sets the treadmill to incline so that she is running uphill which causes more exertion in the same amount of time. Question: Which treadmill setup will cause Ellie to drip more perspiration onto the treadmill?

the inclined treadmill