The Trade Disputes Act of 1929 provided for-

The correct answer is D. The Indian Trade Disputes Act, 1929, created a system of conciliation boards, courts of inquiry and arbitration tribunals to settle disputes between employers and workers. It also made general and sympathetic strikes illegal and restricted picketing, which is the ban on strikes the option refers to. The Act was a colonial response to the labour unrest of the 1920s, and it reflected the state's preference for controlling industrial action through legal machinery.

• A is wrong. Workers' participation in management is a later idea, associated with the Industrial Disputes Act's joint management councils and the Bipartite and Tripartite mechanisms. The 1929 Act has nothing of this kind.
• B is wrong. The Act gave no arbitrary powers to management. Its machinery was formal, with boards and courts, and it did not favour employers unilaterally.
• C is wrong. The Act did not bring in intervention by a British court. It set up Indian tribunal and conciliation machinery.

The core concept is the statutory regulation of industrial relations, which later shaped the Industrial Disputes Act, 1947, the law that replaced it. For Mains, this links to the debate on the balance between labour rights and industrial peace in the post-independence labour framework.

Trap: candidates pick A because the Act is often mixed up with later labour reforms on worker participation. Remember that the 1929 Act was restrictive, not participatory.