Evidence from the British medical service shows that life expectancy may vary not only between income classes, but even within the same income class. If all citizens have the same medical services available to them, why might such disparities exist?

A. Medical expenditures are subject to political forces in a government-provided service.

B. "Free" care can reduce patient use of preventive care as they can seek treatment when they most need it.

C. may be that citizens with lower life expectancies may need support in areas not related to medical care to achieve the same outcomes as those with higher incomes.

D. The law of diminishing marginal returns to higher income individuals

E. Private insurance competes with public care to draw off higher quality services that are only available to the wealthy