People Who Are the Most at Risk for Health Problems

People who are the most at risk for health problems are the most likely to sign up for health insurance.Health insurance premiums rise to cover the increased costs of these people,whereupon the less at risk drop their health insurance coverage,worsening the problem.This problem is called the

A) adverse selection problem.
B) healthcare poverty problem.
C) healthcare uncertainty problem.
D) moral hazard problem.