Unbalanced forces a make an object move opposite the applied force. b maintain the constant motion of an object. c can change an object's speed but not direction. d cause the motion of an object to change.
d) cause the motion of an object to change.
According to Newton's Second Law of Motion, the acceleration of an object is dependent on two variables: the net force acting upon the object and the mass of the object. When forces are unbalanced, they cause the object to accelerate in the direction of the net force. This means that unbalanced forces can cause changes in the object's speed or direction of motion, or both. Therefore, the correct statement is that unbalanced forces cause the motion of an object to change.