Problem: How does the sentence end?

Tanya was having more success producing breastmilk than Betty so the baby of 
OPTIONS:
- Tanya was thinner.
- Betty was thinner.
Answer: Betty was thinner.
sentence: When Cynthia left the house with the oven on, Tanya turned it off; then  OPTIONS:
- Cynthia yelled because it could have started a fire.
- Tanya yelled because it could have started a fire.
complete: Tanya yelled because it could have started a fire.
The trainer told Aaron to go on a diet and not Dennis, by reason that 
OPTIONS:
- Aaron was in worse shape.
- Dennis was in worse shape.
Aaron was in worse shape.
Input: Continue writing.

It's better to buy present at the department store than at the grocery store as the 
OPTIONS:
- department store has less selection.
- grocery store has less selection.

Continued: grocery store has less selection.
Story needs to be completed:
Donald was poorer than Justin, so 
OPTIONS:
- Donald picked up second hand furniture in a yard sale for his new apartment.
- Justin picked up second hand furniture in a yard sale for his new apartment.

My choice:
Donald picked up second hand furniture in a yard sale for his new apartment.
Problem: How does the sentence end?

Donald taught Eric how to do the moonwalk because 
OPTIONS:
- Donald was an amatuer at the dance academy.
- Eric was an amatuer at the dance academy.
Answer:
Eric was an amatuer at the dance academy.