Answer:
The correct answer is b. employers required the National Association of Manufacturers to accept the right of workers to organize unions.
Explanation:
Trade Union Law is the branch of Labor Law or Labor Law that regulates the constitution and activity of trade unions and business organizations, as well as the exercise of the right to strike. However, Trade Union Law is not an autonomous branch, because its norms related to union organization fall within the Labor Law and within this of the Collective Labor Law.