Stephanie and her family went to the pumpkin patch to pick out the perfect pumpkin to carve for Halloween. Stephanie picked out her favorite pumpkin, put it in a wagon, and started pulling her pumpkin and wagon out of the field. All of a sudden, the wagon stopped rolling and Stephanie could not move her pumpkin any further. She knew there was an opposing force holding it in place.

All of the following could be the opposing force except for which one?

A) An upwards hill

B) A small breeze blew

C) A stick lodged in the axle

D) A rock getting stuck under the tire