Ms. Vetter has not worked out in a long time. She is trying to lift her pet bunny cage off the ground to put into her car for their trip to Bunnyville to visit some of her pet bunny's ancestors. If Ms. Vetter does not have enough _____________, she can use a simple machine to help her lift the cage off the ground and into her car.

a. big muscles
b. craft supplies
c. mechanical force
d. mechanical advantage