The correct answer is: a) Chera Dynasty.
The Sangam literature of Tamil Nadu is a body of ancient Tamil literature that dates from the 3rd century BCE to the 3rd century CE. It is a valuable source of information about the history, culture, and society of ancient Tamil Nadu. The Sangam literature provides insights into the Chera Dynasty, which was one of the three major dynasties that ruled Tamil Nadu during this period. The Chera Dynasty was known for its wealth and power, and its rulers were patrons of the arts and literature. The Sangam literature includes poems, songs, and stories that celebrate the achievements of the Chera kings and queens.
The other options are incorrect because they are not dynasties that ruled Tamil Nadu during the Sangam period. The Chola Dynasty ruled Tamil Nadu from the 9th to the 13th centuries CE, the Pandyan Dynasty ruled Tamil Nadu from the 6th to the 13th centuries CE, and the Pallava Dynasty ruled Tamil Nadu from the 6th to the 9th centuries CE.