In the Endogenous Growth Model Presented in the Text, Suppose

In the endogenous growth model presented in the text, suppose that u represents the fraction of time spent working (as opposed to accumulating human capital) and b represents the efficiency of human capital accumulation. The growth rate of human capital equals

A) u(1 - b) - 1.
B) 1 + b(1 - u) .
C) (1 + b) (1 - u) .
D) b(1 - u) - 1.
E) b(1 - u) ².