The Real Wages Earned by American Workers

The real wages earned by American workers

A) has increased steadily ever since 1960.
B) rose during the 1960s and 1970s but remained constant ever since.
C) rose to a peak coinciding with the formation of OPEC in the early 1970s but now has declined to its mid-1960s level.
D) held relatively stable during the years of oil price shocks but now is almost twice what it was at the beginning of the 1960s.
E) remained constant for the past four decades.