4. Two football linemen push against each other in practice. They do not move, but the lineman B moves forward, and lineman A moves backward. Why does this happen?
a. Because the lineman pushes in different directions, then net force is zero.
b. Lineman A pushes with a greater force, cause a net force that acts in his direction.
c. When the lineman pushes on each other, they cause action reaction forces that are unequal.
d. The force is balanced, but the lineman B exerts a greater force causing unbalanced forces.​