Sarah has able to ride a bike without training wheels, unlike Katrina, because 
OPTIONS:
- Sarah was older and had better balance.
- Katrina was older and had better balance.
Sarah was older and had better balance.

Katrina became clingy and upset just before Betty had to leave, because 
OPTIONS:
- Katrina was their child.
- Betty was their child.
Katrina was their child.

Although it was night time, Jeffrey stayed up while Brian went to bed because 
OPTIONS:
- Jeffrey just had some caffeine.
- Brian just had some caffeine.
Jeffrey just had some caffeine.