Answer: Option (B)
Explanation:
National Labor Relations Act also known as Wagner Act of 1935 is referred to as or described as a foundational statute of US labor law under which it guarantees right of the private sector employees in order to organize them into the trade unions, and thus engage in a collective bargaining, and therefore take collective action. This act was originally laid down and written by Robert F. Wagner, and therefore passed by 74th US Congress, and finally signed by Franklin Roosevelt.