Suppose That Over the Last Ten Years Productivity Grew Faster

Suppose that over the last ten years productivity grew faster in Oceania than in Freedonia and the population of both countries was unchanged.

A) It follows that real GDP per person must be higher in Oceania than in Freedonia.
B) It follows that real GDP per person grew faster in Oceania than in Freedonia.
C) It follows that the standard of living must be higher in Oceania than in Freedonia.
D) All of the above are correct.