A Subcontractor Is Engaged in Constructing a Steel Framework for a Building

A subcontractor is engaged in constructing a steel framework for a building. Due to the negligence of a worker, a steel beam becomes loose and falls on three other beams already set in place, causing a complete loss of these beams. The beam on which the worker was working is also a total loss. The subcontractor will pay for

A) only the steel beam on which the employee was working,
B) the loss of all four beams,
C) the loss of the three beams set in place, but not the falling beam,
D) none of the loss.