Automobiles became increasingly popular because of ford’s use of skilled workers to make high-quality cars one at a time. ford’s decision to make luxury cars that only the wealthy could afford. ford’s invention of interchangeable parts to make affordable automobiles. ford’s revolutionary use of the assembly line to make less-expensive cars.< --(it's d)

Ford’s revolutionary use of the assembly line to make less-expensive cars.

Explanation:

Chain production, mass production, series production or mass production was a revolutionary process in industrial production whose base is the assembly line or assembly line or production line; a form of organization of the production that delegates to each worker a specific and specialized function in machines also more developed.

His theoretical idea was born with Taylorism and who had the idea of putting it into practice, was Ransom Olds, who inaugurated his assembly line in 1901 building his prototype called Curved Dash. However, the assembly line system became popular a few years later, thanks to Henry Ford, who, taking the idea of Olds, developed an assembly line with a superior production capacity and of which his emblematic product was the Ford T .

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

the western roman empire flourished, but the eastern portion of the empire struggled.