[Q]: How does the sentence end?

The musician played the cello better than the guitar because he had been playing the
OPTIONS:
- cello for a shorter time.
- guitar for a shorter time.

[A]: guitar for a shorter time.

[Q]: How does the sentence end?

At the BBQ, Christopher asked Lawrence for a hamburger bun, because
OPTIONS:
- Christopher did have an extra one.
- Lawrence did have an extra one.

[A]: Lawrence did have an extra one.

[Q]: How does the sentence end?

Kevin is very conservative and Brian is very liberal which is why
OPTIONS:
- Kevin has a tattoo.
- Brian has a tattoo.

[A]:
Brian has a tattoo.