Reduced supply of labor was not a key factor toward industrialization. Thus, option D is correct.
The transition of a society from the economy to the greater benefits that is mostly focused on agriculture to one that is dependent on the production of products is known as industrialization.
As the age of industrialization was there at that time, there were many people who were available and there were lots of unemployed people, and they were people who used to be available in abundance. Therefore, option D is the correct option.
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