Which option accurately describes an unbalanced force?
A) Each cement block supports a2-N force, but when the foundation is built in a staggered pattern it can support 2,000 N
B) Three rows of cement blocks form a foundation for a house, and the house rests on this foundation
C) A 2-N force presses down on the cement block at the same time as a 1.5-N force presses up on the cement block
D) the force of a house pressing down on its foundation of cement blocks is 3,000 N.