How Were Skilled Workers Able to Secure New Freedoms for Themselves

How were skilled workers able to secure new freedoms for themselves in rapidly expanding industries?

A) Their knowledge allowed them to control the production process and the training of apprentices.
B) They had the ability to advance to managerial positions and from there into the executive boardrooms of big industry.
C) They were able to market their skills by training young apprentices in exchange for high fees.
D) The ownership and control over their shops and tools made their trades unattractive for industrial competition.