Katrina was far more complex of a thinker than Felicia, so
OPTIONS:
- Katrina ended up working in a warehouse.
- Felicia ended up working in a warehouse.
Felicia ended up working in a warehouse.

To be an expert at poker, Samuel chose to play the game for many, many, hours, learning from Robert because
OPTIONS:
- Samuel was more skilled than him.
- Robert was more skilled than him.
Robert was more skilled than him.

Amy was better at learning than Carrie, so
OPTIONS:
- Amy started to worry about failing the test.
- Carrie started to worry about failing the test.
Carrie started to worry about failing the test.