A spring exercise device is shown below. One end of the spring is anchored to a heavy wall bracket, and the other end is attached to a handle. A person pulls the handle horizontally to the right, stretching the spring, and holds the handle completely still in this stretched position.

Which diagram shows the horizontal forces acting on the handle when it is held stationary in this stretched position? Ignore the force of gravity.
Diagram A
Diagram B
Diagram C
Diagram D