The correct option is A along the stretched object.
Tension is a force that stretches something. Tensional force is a force applied by an object being stretched. The object being stretched might be a rope, a string, an elastic band or a wire. The tensional force of the object is applied on the objects that are stretching it. Tensional force is directed along the stretched object. It pulls equally on the objects on either end of the rope or the elastic band that is being stretched.When stringed musical instruments are being tuned, the tensional force of their strings is being changed. The tension of the string will determine its vibration, which will affect the sound it makes.