Donald was very grounded but Michael often got lost in their daydreams. 
OPTIONS:
- Donald was very capricious all the  time.
- Michael was very capricious all the  time.
Michael was very capricious all the  time.

Amy always raised their voice loudly when they were angry but Christine did not because 
OPTIONS:
- Amy had a calmer personality.
- Christine had a calmer personality.
Christine had a calmer personality.

The variety of cars that Katrina had compared to Elena was amazing, and it was because 
OPTIONS:
- Katrina is poor.
- Elena is poor.
Elena is poor.