What Is One Cited Reason Why Healthcare Expenditures Are So

What is one cited reason why healthcare expenditures are so high in the United States?

A) Medicare and Medicaid reduce the supply of medical care.
B) Doctors know patients are likely covered by insurance,which reduces the demand for medical care.
C) Insurance companies attempt to control medical care costs by capping expenditures.
D) Patients covered by insurance consume too little health care.
E) Doctors know patients are likely covered by insurance and provide unnecessary services and treatments.