Serena is making a cake that has three layers. Each layer is 8 inches in diameter and will be baked in a separate pan. To keep the cake layers from sticking to the sides of the baking pans, Serena decides to line the circumference of each baking pan with parchment paper. What is the total length of parchment paper in inches that Serena needs to line the pans for all three layers?

(A) 4 π
(B) 8 π
(C) 16 π
(D) 24π