The word "unsurpassed" in the third paragraph is closest in meaning to______.

A．As there exist weak parts in different departments of a firm, the training of its staff is highly necessary.
B．A training specification is based on the information collected from a job description and a job specification.
C．Training in using skills and learning about skills usually do not happen at the same place.
D．It is easier to evaluate management training than to evaluate the training of workers and technicians.

A．a job description and a job specification
B．what is taught and how it is taught
C．learning about skills and training in using them
D．the savings in time and the savings in cost