Ethan , Marta , and Roscoe found a large aluminum ring, 10 feet in diameter, in a field about 100 feet behind Ethan's house.They estimated the number of complete revolutions that the ring would take if they rolled it to the house. Ethan estimated 10 revolutions, Marta estimated 3 revolutions,and Roscoe estimated 1 revolution. Who made the most reasonable estimate?

A. Ethan B.Marta C.Roscoe
D. No one's estimate was reasonable.

what is 100/(PI*diameter)?