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Which of the following enabled mass production in the 1920s?

a. standardization of spare parts
b. mass availability of electricity
c. introduction of the assembly line
d. new precision-manufacturing technologies

User Masgar
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the answer is C i got it right

User Cheekujha
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It was the "c. introduction of the assembly line" that enabled mass production in the 1920s, since this meant that products could be made with a division of labor. 
User Nathalie
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