You are weighing 3 boulders. 1 weighs one-quarter of a tone, 1 weighs 8,112 ounces, and 1 weighs 505 pounds. Which one is heaviest,a nd which is lightest? The heaviest weighs ___ and the lightest weighs ___
a. one quarter ton
b. 8,112 ounces
c. 505 pounds