In R Williams Construction Co

In R. Williams Construction Co. v OSHRC, a trench collapsed at a construction site, killing one worker, and severely injuring another. A hydraulic jack supporting the wall had been removed, and the walls of the trench were not sloped, as required by OSHA regulations. The construction firm argued that, although it did not know what the OSHA requirements were, its employees had much work experience and common sense, and they talked about safety "all the time." The OSHRC ruled: ​

A) for the employer, because of the several years of experience of its workers
B) for the employer, because the employees frequently talked about safety
C) for the workers, because there was a death and a serious injury
D) for the workers, because OSHA regulations applied, and it is not a defense that the firm did not know about OSHA regulations