The correct answer is: a) Dravidians.
The Dravidians are an ethnic group native to South Asia. They are the largest ethnic group in India, accounting for about 25% of the population. The Dravidians are also the majority ethnic group in Sri Lanka, Pakistan, and Bangladesh.
The Dravidians are believed to have originated in the Indus Valley Civilization. They are thought to have migrated to South Asia from Central Asia around 3000 BC. The Dravidians are divided into several different groups, including the Tamils, Telugus, Kannadas, and Malayalis.
The Dravidians have a rich culture and history. They are the creators of the Indus Valley Civilization, one of the earliest civilizations in the world. The Dravidians also have a long tradition of literature, art, and music.
The Dravidians are a proud and independent people. They have a strong sense of identity and culture. The Dravidians have fought for their rights and freedoms throughout history. They are a resilient and determined people who have made significant contributions to the world.
The other options are incorrect because they are not ethnic groups. The Cholas, Pandyas, and Pallavas were dynasties that ruled parts of South India in the ancient and medieval periods.