Michael is severely underweight and Christopher is obese because 
OPTIONS:
- Michael doesn't eat enough food during the day.
- Christopher doesn't eat enough food during the day.
Michael doesn't eat enough food during the day.

Donald but not Nelson was able to repair the car because 
OPTIONS:
- Donald had all the tools that were needed.
- Nelson had all the tools that were needed.
Donald had all the tools that were needed.

Adam loved unusual foreign foods but Derrick hated them. 
OPTIONS:
- Adam thought pig feet sounded disgusting.
- Derrick thought pig feet sounded disgusting.
Derrick thought pig feet sounded disgusting.