Which of the following best summarizes the three phases of industrialization?

A. First, each worker did one step; second, factories brought specialized workers together; third, workers used machines

B. First, factories brought specialized workers together; second, each worker did one step; third, workers used machines

C. First, workers used machines; second, factories brought specialized workers together; third, each worker did one step

D. First, factories brought specialized workers together; second, workers used machines; third, each worker did one step