Which best describes the use of interchangeable parts in manufacturing in the 1800s?

a. interchangeable parts were designs for the construction of mills and factories that used resources, such as water, to power the equipment.

b. interchangeable parts were identical parts that could be exchanged for one another in the manufacture of guns, clocks, and other goods.

c. interchangeable parts were goods that were custom-made by hand using the expertise of skilled workers.

d. interchangeable parts were pieces of equipment that were used by factory workers to make one element of an entire machine or mechanism.