What is the advantage of mass production and interchangeable parts?

Interchangeable parts, popularized in America when Eli Whitney used them to assemble muskets in the first years of the 19th century, allowed relatively unskilled workers to produce large numbers of weapons quickly and at lower cost, and made repair and replacement of parts infinitely easier.

Explanation:

definitely a for sure. ill see and update if i get the answer

your answer will most likely be a.