Angela rode horses all their life and Amy just started, so 
OPTIONS:
- Angela trained really hard over the weekend.
- Amy trained really hard over the weekend.
Amy trained really hard over the weekend.

Brett sold their favorite action figure to Ryan, because 
OPTIONS:
- Brett wanted to increase their bank account.
- Ryan wanted to increase their bank account.
Brett wanted to increase their bank account.

Carrie but not Samantha went to the gynecologist to ask for birth control because 
OPTIONS:
- Carrie had regular menstruation.
- Samantha had regular menstruation.
Samantha had regular menstruation.