The correct answer is: a) Organize agricultural laborers.
The Tamil Nadu Cultivators Protection Association was formed in 1937 by E.V. Ramasamy Naicker, also known as Periyar, to organize agricultural laborers and fight for their rights. The association was successful in improving the working conditions of agricultural laborers and in getting them a fair share of the profits from their labor.
Option b) is incorrect because the association did not advocate for land reforms. Land reforms were implemented in India after independence, but the Tamil Nadu Cultivators Protection Association was not involved in this process.
Option c) is incorrect because the association did not promote cooperative farming. Cooperative farming is a system of agriculture in which farmers work together to produce and market their crops. The Tamil Nadu Cultivators Protection Association did not promote this system of agriculture.
Option d) is incorrect because the association did not provide credit and marketing support. Credit and marketing support are important services that can help farmers to improve their livelihoods. However, the Tamil Nadu Cultivators Protection Association did not provide these services.