Government statistics show that the real (adjusted for inflation) average income for families has risen over the last five years. Ttherefore, since this year the Andersen family' s income is average for families, the family' s real income must have increased over the last five years. The reasoning in the argument is most vulnerable to criticism on the grounds that the argument
A: overlooks the possibility that most families' incomes are below average
B: fails to take into account inflation with respect to the Andersen family's income
C: presumes, without providing justification, that the government makes no errors in gathering accurate estimates of family income
D: fails to consider the possibility that the Andersen family's real income was above average in the recent past
Choose A, B, C or D as your solution.
D