In the Equation Describing the Accumulation of Human Capital $$H ^ { \prime } = b ( 1 - u ) H \text {, the parameter } b$$

In the equation describing the accumulation of human capital, $$H ^ { \prime } = b ( 1 - u ) H \text {, the parameter } b$$ determines

A) the growth rate of the labour force in equilibrium.
B) physical capital accumulation.
C) the efficiency of human capital.
D) the efficiency of the educational sector.
E) the level of human capital in equilibrium.