Concept:A couple is formed by two equal, parallel, and opposite forces acting at different points on a body.
It causes rotation only, with no translational motion.
Explanation:Twisting a screwdriver, turning a cross wrench, and rotating a steering wheel all apply two opposite forces separated by a distance.
For a screwdriver, the hand applies equal and opposite forces to the handle, producing a turning effect.
For a cross wrench, the forces on opposite sides of the nut create the couple that loosens or tightens it.
For a steering wheel, one hand pushes up while the other pulls down, generating a rotational couple.
Since all three described actions are examples of a couple, the correct selection must include every one of them.
Answer:A. All of the above.