Recently a Labor Union Argued That the Standard of Living

Recently a labor union argued that the standard of living of its members was falling.A critic of the union argued that this could not possibly be true because the union had been acquiring increases in the nominal incomes of its members through collective bargaining.Is the critic correct?

A) Yes,because when you have a large nominal income,your standard of living automatically increases.
B) No,because real income may fall if prices increase more proportionately than the increase in nominal income.
C) No,because real income may fall if prices increase less proportionately than the increases in nominal income.
D) Yes,because real income may fall if prices increase less proportionately than the increases in nominal income.