Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Write a variation model using k as the constant of variation.
-The variable s varies indirectly as t.

A) $t = k s$
B) $s = k + s$
C) $s = \frac { k } { t }$
D) $s = k t$