If $\mathrm { f }$ Varies Jointly As $\mathrm { q } ^ { 2 }$

Multiple Choice

If $\mathrm { f }$ varies jointly as $\mathrm { q } ^ { 2 }$ and $h$ , and $\mathrm { f } = - 81$ when $\mathrm { q } = 3$ and $\mathrm { h } = 3$ , find $\mathrm { f }$ when $\mathrm { q } = 2$ and $h = 6$ .

A) $f = - 18$
B) $f = - 72$
C) $\mathrm { f } = - 36$
D) $f = - 12$