Increased mechanization of workplaces led to an increase in white-collar jobs.
The process of mechanisation is the transition from doing labour primarily or solely by hand or with animals to doing it with equipment.
the action or process of integrating machines into a sector of the economy or other activity to replace human labour
A white-collar worker is a member of a group of workers who are noted for making higher average income doing highly skilled work rather than by doing manual labour. White-collar professionals have traditionally been characterised as the "shirt and tie" crowd, defined by management and office work rather than "getting their hands dirty." White-collar employees are desk-based, suit-and-tie employees. Compared to blue-collar workers, they typically earn more money. A high degree of education and the expectation of landing a comfortable position with benefits were once associated with white-collar jobs. The fact that white-collar employment has supplanted previous forms of working class employment in the United States and other developed countries now blurs this divide.
Supporting answer
Hence option A is correct answer
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