And michelangelo were in the service of pope julius ii in the early years of the sixteenth century.

Option: D.  Prices of cars remained unchanged.

Explanation:

The assembly line for the first time in Henry Ford automobile factory helped him in mass production of cars. Assembly lines help in completion work in less time by building various work stations in one line. Assembly lines also helped to reduce the prices of the cars by less than $300. Earlier cars were expensive at $850, which enable people to buy cars because it was higher than the average man salary.