Which of the following is one of the effects of ford's assembly-line production methods? people were not replaced by machines. automobiles became more expensive to make. wages decreased for employees. automobiles became more expensive to buy.

I believe the answer is: People were not replaced by machines

The assembly line production method separates different group of workers to handle only one specific parts of product at the time before finally combined them into one finished product. This method actually need larger amount of people, not machines.