In the early 1800s, the method of manufacturing which made mass production was the use of interchangeable parts.
Option A is the correct answer.
What is meant by manufacturing?
Manufacturing is the activity where the finished products are produced by converting the raw materials.
During the time of 1800s, the interchangeable parts, that is, the components that can be replaceable for other alike products, and these parts were used in the production process. This resulted in creating the production of items on a large-scale basis.
Therefore, the interchangeable parts were one of the methods of production that led to mass production in the 1800s.
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