Which of the following reduce the prices of higher-cost products, such as automobiles, for consumers in the 1920s. installment plans the introductions of coupons assembly lines the development of advertisements

assembly lines

An assembly line is a manufacturing process in which products are moved from one station to the next, with specific components being added at each stage until the product is completed. This method is significantly faster and cheaper than traditional assembly. The system is often associated with Henry Ford, who used it, along with interchangeable parts, to assemble his cars. This lowered the prices of goods and made cars accessible to the general population.

the answer is 250 percent.

i dont know but i need points