In the Endogenous Growth Model Presented in the Text, Suppose $u$

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 consumption equals

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