【单选题】

Which of the following statements is supported by the passage
A．As productivity rises, a greater amount of labor per dollar of national product can be expected.

B．Unemployment falls when production expands faster than labor force
C．Reduction in the growth of productivity and cutback in potential output are in the national interest.
D．The long-term rate of growth in our economy, if continued into the future, will eventually decrease our unemployment rate, all other factors remaining constant.