Write an Equation to Describe the Variation $x$ And Inversely as the Square Of

Multiple Choice

Write an equation to describe the variation. Use k for the constant of proportionality.
-W varies directly as $x$ and inversely as the square of $y$ .

A) $w = \frac { k x } { y ^ { 2 } }$
B) $w + x - y ^ { 2 } = k$
C) $w = \frac { k y ^ { 2 } } { x }$
D) $w x y ^ { 2 } = k$