Guilds were professional organizations that _____.

conducted military affairs in Europe

controlled how their industry operated

protected their members' interests against outsiders

wrote laws

Verified Answer :

Guilds were associations of people from the same industry: artisans and merchants who controlled their field, that is controlled what and how the services could be. They controlled the tools and the procedure of production and services.

The correct answer is:
controlled how their industry operated

controlled how their industry operated