Problem: Derrick's ukulele playing sounded far worse than Leslie's performance for the reason that 
OPTIONS:
- Derrick was an expert at the instrument.
- Leslie was an expert at the instrument.

My choice: Leslie was an expert at the instrument.


Problem: Rabbits are cute but Nelson was allergic, but not Brian, so 
OPTIONS:
- Nelson had one for a pet.
- Brian had one for a pet.

My choice: Brian had one for a pet.


Problem: Jane could not put the battery in the calculator because the 
OPTIONS:
- battery was too small.
- calculator was too small.

My choice: calculator was too small.


Problem: Creating restaurant review blogs is a passion of Betty but not Rebecca because 
OPTIONS:
- Betty is bored by writing and food.
- Rebecca is bored by writing and food.

My choice:
Rebecca is bored by writing and food.