Find the Constant of Variation for the Stated Condition: a Varies

Multiple Choice

Find the constant of variation for the stated condition: A varies jointly as b and h , and A = 135 when b = 24 and h = 9.

A) $k = 5$
B) $k = - \frac { 8 } { 5 }$
C) $k = 7$
D) $k = \frac { 8 } { 5 }$
E) $k = \frac { 5 } { 8 }$