Question

what innovation made complicated products easier to make?
a. women in the labor force
b. better shipping methods
c. lower pay for workers
d. interchangeable parts

Explanation:

Interchangeable parts allow for mass - production and simplify the manufacturing process of complicated products by making it easier to assemble and replace components. Women in the labor force affect the labor supply but not product - making directly. Better shipping methods relate to distribution, not production ease. Lower pay for workers impacts costs, not the ease of making products.

Answer:

D. Interchangeable parts