In Order for a Society to Have a Rising Standard

Multiple Choice

In order for a society to have a rising standard of living, what must happen to the growth of the output per worker?  

A)  The output per worker must be growing more slowly than the labour force. 
B)  The output per worker must be growing at the same rate as the population. 
C)  The output per worker must be growing faster than the population. 
D)  The output per worker must be growing more slowly than the population.