[Q]: How does the sentence end?

Katrina could feel her period coming. So when she snapped at Angela,

[A]: Angela thought it was probably out of rudeness.

[Q]: How does the sentence end?

The cart went slower than the scooter did because the

[A]: scooter had a much bigger motor.

[Q]: How does the sentence end?

At the high school, Rebecca is better at talking to girls than Laura because

[A]:
Rebecca is smoother.