Write an Equation That Expresses the Relationship $\mathrm { m }$

Multiple Choice

Write an equation that expresses the relationship. Use k as the constant of variation.
-d varies directly as the square of $\mathrm { m }$ .

A) $\mathrm { d } = \mathrm { km } ^ { 2 }$
B) $d = \frac { k } { m ^ { 2 } }$
C) $d = k \sqrt { m }$
D) $\mathrm { d } = \frac { \mathrm { k } } { \sqrt { \mathrm { m } } }$