Explanation:

- Kavadi Aattam:

- This is the correct answer. It's a devotional dance performed by followers of Lord Murugan during rituals and festivals. The dancers carry a "Kavadi," a semicircular, decorated structure, as an act of penance and devotion.

- Mayilattom:

- A traditional art form where dancers imitate the graceful movements of a peacock. It is associated with Lord Subramanya (another name for Murugan) but not directly part of ceremonial worship.

- Therukoothu:

- It's a form of street theater popular in Tamil Nadu. While it can depict stories from Hindu mythology, it's not specifically a ritual dance for Murugan.

- Kummi:

- A folk dance that involves rhythmic clapping and is mainly celebratory. It is not specifically tied to worshiping Murugan.