(HELP, ME NOW! LOTS OF POINTS)A circular skating rink has a radius of 40 feet. Which expression can be used to find the circumference of the skating rink, in feet?
(A) 40/π
(B) 2 ⋅ 40 ⋅ π
(C) 40 ⋅ π
(D) π ⋅ 40^2

