The use of steam-powered machinery intended that workers no longer required?

The use of steam-powered machinery meant that workers no longer required . . .

A. Years of training
B. Set hours
C. A set workplace
D. Supervision
Answers:
C. is the best answer.
Prior to steam power, factories needed hose power.
Not sure exactly what this question is after.. but I think c.

Before steam engines, mills have to be located near fast moving streams and rivers so wet power could be used. Steam allows the plants to be located anywhere, as coal could be transported in.

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