[Q]: How does the sentence end?

A lot of people prefer Android to Apple operating systems because the 
OPTIONS:
- Android OS is cheaper.
- Apple OS is cheaper.

[A]: Android OS is cheaper.


[Q]: How does the sentence end?

Katrina is a client of Rebecca at the salon and 
OPTIONS:
- Katrina is grateful for the work that they perform.
- Rebecca is grateful for the work that they perform.

[A]: Katrina is grateful for the work that they perform.


[Q]: How does the sentence end?

Victoria dyed the hair of Jennifer a bright red, and 
OPTIONS:
- Victoria thanked them for doing such a great job.
- Jennifer thanked them for doing such a great job.

[A]:
Jennifer thanked them for doing such a great job.