Decide on What Substitution to Use, and Then Evaluate the Given

Multiple Choice

Decide on what substitution to use, and then evaluate the given integral using a substitution. $\int 23.1 \sqrt { - 7 x + 9 } \mathrm {~d} x$

A) $2.2 ( - 7 x + 9 ) ^ { \frac { 2 } { 3 } } + C$
B) $- 2.2 \sqrt { - 7 x + 9 } + C$
C) $- 2.2 ( - 7 x + 9 ) ^ { \frac { 3 } { 2 } } + C$
D) $\frac { 80.85 } { \sqrt { - 7 x + 9 } } + C$
E) $- \frac { 80.85 } { \sqrt { - 7 x + 9 } } + C$