Nowadays, good babysitters are in great _____, so many companies have been set up to train good babysitters.[ ]

A. request

B. need

C. demand

D. requirement

依据《生产经营单位安全培训规定》，国务院有关主管部门按照各自职责指导监督自身行业安全培训工作，并按照本规定制定实施办法。