Problem: How does the sentence end?

The computer needed a new monitor, but the keyboard was fine, because the 
OPTIONS:
- monitor was very old.
- keyboard was very old.
Answer: monitor was very old.
sentence: The mother chose to buy the board game instead of the video game because the  OPTIONS:
- board game was cheaper.
- video game was cheaper.
complete: board game was cheaper.
Sissy got a henna ink tattoo on the skin of her forearm but it didn't show up well. The 
OPTIONS:
- ink was too light.
- skin was too light.
ink was too light.
Input: Continue writing.

Rachel was less irritated than Jennifer by the tweeting of the cockatoo, because 
OPTIONS:
- Rachel had a headache.
- Jennifer had a headache.

Continued: Jennifer had a headache.
Story needs to be completed:
Aaron was learning to bake from Joseph since 
OPTIONS:
- Aaron was an expert at this art.
- Joseph was an expert at this art.

My choice:
Joseph was an expert at this art.
Problem: How does the sentence end?

Emily was always leading  Jennifer in the math competition, as 
OPTIONS:
- Emily had a math tutor .
- Jennifer had a math tutor .
Answer:
Emily had a math tutor .