Refer to the Graph for the Health Care Market

Refer to the graph for the health care market. A health insurance plan that pays four-fifths of the cost of a consumer's health care leads to

A) overconsumption of health care by 300 units.
B) overconsumption of health care by 600 units.
C) overconsumption of health care by 150 units.
D) a socially efficient consumption level of health care.