Write an Equation to Describe the Variation $a = \frac { t } { k }$

Multiple Choice

Write an equation to describe the variation. Use k for the constant of proportionality.
-t varies inversely as a

A) $a = \frac { t } { k }$
B) $t = \frac { a } { k }$
C) $t = \frac { k } { a }$
D) $\mathrm { a } = \mathrm { kt }$