What would be a possible opportunity cost of you going to a doctor for a check-up? A. the cost of the insurance reimbursing the doctor B. the opportunity to make an acquaintance in the waiting room C. the cost of getting nontraditional care D. lost income due to not being at work for those hoursA production possibilities frontier with increasing opportunity cost is considered: A. convex. B. horizontal. C. concave and bowed outward. D. A straight line