The llamas and horse spend most of their day wandering back and forth among their favorite spots in the yard, and have worn paths that are two feet wide among them. Amazingly, these paths correspond to a minimal spanning tree network!

The property owner is fearful that the bare dirt paths will wash out during heavy rains, so he initiates a soil conservation project to lay sod over all of the bare dirt paths. How many square feet of sod must he purchase?
A) 1080
B) 540
C) 680
D) 820

Answer: C