Let $C(f(t))$ Be a Composite Function, Where $V=f(t)$ Is the Volume of Water, in Cubic Feet, Emitted by Volume

Multiple Choice

Let $C(f(t) )$ be a composite function, where $V=f(t)$ is the volume of water, in cubic feet, emitted by a sprinkler system after $t$ minutes, and $C(V)$ is the cost, in dollars, of $V$ cubic feet of water. What are the units of $C(f(t) )$ ?

A) cubic feet
B) minutes
C) dollars