Explanation:

- Margomkali is a traditional Christian folk art form from Kerala. It is performed by the St. Thomas Christians of Kerala and involves singing and ritualistic dance.

- It is known for its unique style, where performers form a circle around a lighted lamp and sing while maintaining religious and cultural significance.

- Option 1: Assam - Assam is known for its own rich culture and folk dances like Bihu, but not Margomkali.

- Option 2: Punjab - Punjab has vibrant folk dances like Bhangra and Gidda, but Margomkali is not one of them.

- Option 3: Nagaland - Nagaland features tribal dances, distinct from the Margomkali tradition found in Kerala.

- Option 4: Kerala - Correct. Margomkali is indeed a folk tradition from Kerala.