Which of the Following Stands True for the Determinants of Growth

Which of the following stands true for the determinants of growth?

A) The long-run aggregate supply curve is a horizontal line at the potential level of real GDP.
B) Land can be combined with labor and capital to produce goods and services.
C) The labor force typically grows more rapidly in industrial countries than in developing countries because birth rates are higher in industrial countries.
D) The ability of a country to invest in capital goods is tied to its ability to spend.
E) The size of the labor force is a function of the size of the youth in the population and the percentage of that population that is in the labor force.