What threatened the livelihood of urban artisans in the nineteenth century in industrial economies?

A. Increased costs of raw materials and lower demand for their work pushed urban artisans to accept a wage system to make ends meet.
B. The influx of highly-skilled artisans from other towns and the countryside posed a threat to the livelihood of urban artisans.
C. Journeymen artisans could not realistically expect to become masters of their own workshops owing to the firmly established guild system.
D. The practice of requiring workshops to increase the division of labor devalued the unique, individual skills of workers.