A Recent Study of the Canadian Health Care System Estimates

A recent study of the Canadian health care system estimates that 20 percent of the difference between health care spending in the U.S.and Canada is due to age differences between the two populations.Other reasons for the differences include

A) less access to medical technology in Canada.
B) the hub-and-spoke hospital system in Canada.
C) the monopsony power of the Canadian provincial health plans in negotiating fees with physicians' associations.
D) the fact that there is no large inner-city population in Canada to drive up costs.
E) all of the above.