Problem: Cynthia was given a medical diagnosis by Maria at an appointment.

My choice: Maria was the physician.

Problem: Ian asked Kevin to help with their taxes because

My choice: Kevin was a successful, trained accountant.

Problem: Carrie's accent is very heavy, whereas Mary doesn't have one.

My choice: Mary was born in the US.

Problem: The winner of the cupcake contest was Felicia and not Katrina because

My choice:
Katrina was irresolute.