Answer:
C.mass production!
Explanation:
Mass production helped affect the price change of the model T automobile.
The factor that best accounts for the price change in the Model T automobile is Mass production.
"Mass production is the industrial technique to produce large quantities of similar products in constant flows on production lines."
Mass production best accounts for the price change in the Model T automobile because mass production results in lower costs because "the automated assembly line production process requires fewer workers."
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