Answer:
D. Fords revolutionary use of the assembly line to make less-expensive cars.
Explanation:
The immediate impact of the assembly line was revolutionary. The use of interchangeable parts allowed for continuous workflow and more time on task by laborers. Worker specialization resulted in less waste and a higher quality of the end product. Sheer production of the Model T dramatically increased.
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The main Idea is "Robots are better assembly workers" because everything at the beginning of the passage leads up to how robots can be more productive in bad environments.<span />
B is the answer to your question
