Suppose $r = f(t)$ is the radius, in centimeters, of a circle at time $t$ minutes, and $A(r)$ is the area, in square centimeters, of a circle of radius $r$ centimeters.

Which of the following statements best explains the meaning of the composite function $A(f(t))$?

A. The area of a circle, in square centimeters, of radius $r$ centimeters.
B. The area of a circle, in square centimeters, at time $t$ minutes.
C. The radius of a circle, in centimeters, at time $t$ minutes.
D. The function $f$ of the minutes and the area.
E. None of the above