The correct answer is: B) Trade unionism.
A trade union is an organization of workers that aims to improve their working conditions and wages. Trade unions are often formed in response to poor working conditions or low wages. They can negotiate with employers on behalf of their members, and they can also strike if necessary.
The Travancore Labour Association was founded in 1914 by T.K. Madhavan. It was one of the first trade unions in India. The association fought for better working conditions for workers in the Travancore region. It also campaigned for the right to vote for workers.
The other options are incorrect. A cooperative society is a business that is owned and run by its members. A political party is a group of people who share the same political beliefs and who work together to get their candidates elected to office. A welfare organization is an organization that provides assistance to people in need.