The 1933 national industry recovery act
a) created the works progress administration.
b) gave employees the right to bargain collectively.
c) effectively ended the great depression.
d) created jobs for writers, musicians, and artists.

The 1933 National Industry Recovery Act gave employees the right to bargain collectively.

Option - B

Explanation:

The National Industrial Recovery Act of 1933 (NIRA), a consumer and labor law was passed by US Congress in 1993 witha purpose of giving authority to the then president to regulate and monitor the prices and wages fairly to recover and upgrade the economic standard.

Section 7(a) of the bill protected the collective bargaining rights for unions.Collective bargaining is the negotiation between group of employees and employers based on the terms and conditions of employment like hours of work, wages, working environment, grievance redressal, and the responsibilities and rights of trade unions.

i think its the outcome of people's preferences.