Unbalanced forces a can change an object's speed but not direction. b maintain the constant motion of an object. c make an object move opposite the applied force. d cause the motion of an object to change.
d cause the motion of an object to change.
Explanation: Unbalanced forces are those that do not cancel each other out. When forces are unbalanced, they can cause an object to accelerate, which means there can be a change in the object's speed, direction, or both. Therefore, the correct statement among the options given is that unbalanced forces can cause the motion of an object to change (option d). Unbalanced forces do indeed have the capacity to change an object's speed and/or direction.