In Recent Years,the Aboriginal Population Has Been Growing Much Faster

In recent years,the Aboriginal population has been growing much faster than the Canadian population as a whole.According to the text,which of the following is NOT a reason for this trend?

A) Residents of reserves have been more completely counted.
B) More individuals count themselves as Aboriginal instead of "passing" as white.
C) Opportunities now match those of the rest of Canadians, so families are larger.
D) As a group, more Aboriginal people are in a child-bearing age range.