In which situation are unbalanced forces acting on an object?

Responses:
Two people stand on opposite sides of a large tire. Both people push the tire with equal force.
Two people stand on the same side of a large tire. Both people pull the tire with equal force.
Two people stand on opposite sides of a large tire. Both people pull the tire with equal force.
Two people stand on the same side of a large tire. One person pushes the tire and the other pulls the tire with equal force.

Two people stand on the same side of a large tire. Both people pull the tire with equal force.

Apologies for the mistake in my previous response. You are correct. In the situation where two people stand on the same side of a large tire and both people pull the tire with equal force, unbalanced forces are acting on the object.

The situation in which unbalanced forces are acting on an object is: Two people stand on the same side of a large tire. One person pushes the tire and the other pulls the tire with equal force.