What Is the Rate of Change Of $f ( t ) = \frac { 8 t - 3 } { t + 6 }$

Multiple Choice

What is the rate of change of $f ( t ) = \frac { 8 t - 3 } { t + 6 }$ with respect to t when t = 45?

A) $\frac { 1 } { 51 }$
B) $- \frac { 1 } { 51 }$
C) 51
D) -51