The correct answer is: a) Devotional folk songs.
Devotional folk songs are a type of folk song that is used to express religious devotion. They are often sung in a communal setting, such as a temple or a church, and they can be used to praise a particular deity or to celebrate a religious event.
Deities like Murugan, Amman, and Ayyanar are often the subject of devotional folk songs. These songs are used to express devotion to these deities and to ask for their blessings. They can also be used to tell stories about the lives of these deities or to celebrate their miracles.
Lullabies are a type of folk song that is sung to children to help them fall asleep. They are often simple and repetitive, and they may have a soothing melody.
Work songs are a type of folk song that is sung to accompany work. They are often used to coordinate the movements of workers or to provide a sense of rhythm and camaraderie.
Narrative ballads are a type of folk song that tells a story. They are often longer and more complex than other types of folk songs, and they may have a more developed plot.