Bonnie Is Debating Whether to Take a Job as a Professional

Bonnie is debating whether to take a job as a professional therapist or a florist. She will earn $40,000 a year as a therapist or $22,000 a year as a florist. If she chooses to be a therapist, the opportunity cost is

A) $40,000.
B) $22,000.
C) $18,000.
D) unable to determine.