In the Endogenous Growth Model Presented in the Text, Suppose $1 + b ( 1 - u )$

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) $1 + b ( 1 - u )$ .
B) $( 1 + b ) ( 1 - u )$ .
C) $u ( 1 - b ) - 1$ .
D) $b ( 1 - u ) ^ { 2 }$ .
E) $b ( 1 - u ) - 1$ .