The correct answer is A: Above the climber's head level. A shock-absorbing lanyard should be attached to the tower above the climber's head level when working above ground. This positioning allows the shock absorber to work properly and limits fall distance. Shock-absorbing lanyards are designed to stretch and absorb energy during a fall, reducing the impact force. For the shock absorber to work properly and limit fall distance, the attachment point must be above the climber's head. If attached at waist level or below, the fall distance would be greater, and the shock absorber might not have enough room to deploy properly. Attaching above head level ensures the lanyard can catch the fall quickly and the shock absorber can function as designed, minimizing both fall distance and impact force.