The correct answer is: a) Sangam period.
The Sangam period was a time of great cultural and economic prosperity in South India. It is believed to have lasted from around 300 BCE to 300 CE. The Sangam period is named after the Tamil literary works known as the Sangam literature, which were composed during this time. The Sangam literature provides a wealth of information about the history, culture, and society of South India during this period.
The Keezhadi excavations have revealed evidence of a sophisticated urban settlement dating back to the Sangam period. The settlement was located on the banks of the Vaigai River in Tamil Nadu. The excavations have uncovered a number of artifacts, including pottery, coins, and jewelry. The artifacts provide evidence of the trade and commerce that took place during the Sangam period.
The Keezhadi excavations are significant because they provide new insights into the history of South India. The excavations have revealed evidence of a sophisticated urban settlement that was previously unknown. The artifacts that have been uncovered provide evidence of the trade and commerce that took place during the Sangam period. The Keezhadi excavations are a valuable addition to our understanding of the history of South India.
The other options are incorrect because they do not correspond to the time period of the Sangam period. The Pallava era was a time of great cultural and political change in South India. It is believed to have lasted from around 300 CE to 900 CE. The Pallavas were a powerful dynasty that ruled over much of South India during this time. The Chola empire was a powerful empire that ruled over much of South India from around 900 CE to 1300 CE. The Vijayanagara period was a time of great cultural and political prosperity in South India. It is believed to have lasted from around 1336 CE to 1646 CE.