[Q]: How does the sentence end?

The professor preferred to demonstrate the problem on a chalkboard rather than a projector, because the

[A]: projector was less effective.

[Q]: How does the sentence end?

Christine was giving a speech on deforestation and needed help from Jennifer because

[A]: Christine wasn't as knowledgeable in the topic.

[Q]: How does the sentence end?

At the new job, Mary was given a smaller uniform than Angela because

[A]:
Angela was heavier.