The correct answer is: a) Trade unions.
Trade unions are organizations that represent the interests of workers in a particular industry or occupation. They negotiate with employers on behalf of their members, and they can also provide a range of other services, such as legal advice and training.
Trade unions have a long history in Tamil Nadu. The first trade unions were formed in the early 20th century, and they played a significant role in the independence movement. After independence, trade unions continued to play an important role in the development of Tamil Nadu. They have campaigned for better wages and working conditions, and they have also been involved in social and political movements.
Tenant associations are organizations of tenants who share a common interest in their tenancy rights. They may be formed to negotiate with landlords, to provide support and advice to tenants, or to campaign for changes to tenancy laws.
Self-help groups are groups of people who come together to help each other solve common problems. They may be formed to provide financial assistance, to share information and resources, or to provide emotional support.
Caste-based guilds are organizations of people who belong to the same caste. They may be formed to protect the interests of their members, to promote their culture, or to provide social services.
In conclusion, the correct answer to the question “An early form of labor organizing in Tamil Nadu was the formation of:” is a) Trade unions.