An office building at State University contains a concrete stairway, the carpet on which has become worn and frayed. Despite numerous warnings by the Occupational Safety and Health Administration, the university has not replaced a burned-out light in the stairway. Fred, a student, recently caught his heel in the torn carpet, tripped, and fell down the stairway. He was hospitalized for a severe concussion and other injuries. After his release from the hospital, he required much more medical attention and medication and had to withdraw from the university for a semester. He brings suit against the university.

Which one of the following is the bestling of causal analysis for Fred's attorney to pursue in the personal injury case?

(A) The concrete steps, because they were hard, worsened Fred's injuries.
(B) The university is responsible for the condition of the carpet.
(C) The burned-out light constitutes negligence.
(D) The distance Fred fell worsened his injuries.
(E) The Occupational Safety and Health Administration has no jurisdiction over the university.