Answer:
a. National Labor Relations Act
Step-by-step explanation:
The National Labor Relations Act, shortly known as NLRA came into existence in the year 1935. The Congress enacted the National Labor Relation Act.
It is also known as the Wagner Act.
The National Labor Relations Act protects the employees right and it also encourages and engages in collective bargaining with the management of the organisation.
It also gives the right and freedom to create a trade union.
Thus the answer is a. National Labor Relations Act.