Question

this excerpt is from henry fords book, my life and work
there are 5,000 parts in a ford car. moving assembly lines make car building easier when each man is performing only one job over and over again. that is what makes the assembly line so efficient.
-adapted from henry ford, 1922
based on the excerpt and your knowledge of u.s. history, which major effect did fords assembly process have?
it decreased productivity by limiting worker creativity.
it led to the decline of mass production in favor of skilled craftsmanship.
it lowered production costs and made consumer goods more affordable.

Explanation:

The assembly line, as described, allows workers to focus on one task repeatedly. This specialization increases efficiency. With higher efficiency, production costs can be lowered. Lower costs mean products (like cars) can be sold at more affordable prices for consumers. Mass production (which the assembly line is a part of) became more prominent, not declined. And while it might limit worker creativity in a sense (as they do one task), the main effect related to the options given and historical knowledge is the cost - affordability aspect.

Answer:

It lowered production costs and made consumer goods more affordable.