The correct answer is option 'C', Manimekalai.

Manimekalai is a Tamil text that was authored by Seethalai Satthanar during the later Sangam period. It is considered one of the five great epics of Tamil literature, known as "Pancha Ettuthokai." The Sangam period is a significant era in the history of Tamil literature, dating back to around 300 BCE to 300 CE. It was during this period that Tamil literature flourished, and numerous literary works were created.

Here is a brief explanation of the other options:

a) Purananuru: Purananuru is a collection of 400 poems written by various poets during the Sangam period. It is an anthology of Sangam literature that primarily focuses on heroic themes, love, and various aspects of Tamil society.

b) Tolkappiam: Tolkappiam is a Tamil grammar work that was composed by the poet Tolkappiyar during the Sangam period. It is considered one of the oldest and most comprehensive treatises on Tamil grammar and linguistics.

d) Agattiyam: Agattiyam is another Tamil grammar work attributed to the sage Agastya. It is one of the earliest known Tamil grammatical texts and provides insights into the structure and rules of the Tamil language.

Now, let's discuss the significance of Manimekalai:

- Manimekalai is an epic poem that consists of 30 cantos or chapters. It is a sequel to another Tamil epic, Silappatikaram, which was authored by Ilango Adigal.

- The text revolves around the life of the protagonist, Manimekalai, who is a beautiful and virtuous dancer. It narrates her spiritual journey and the challenges she faces while navigating the materialistic world.

- Manimekalai explores various philosophical and ethical themes, including the concept of karma, the pursuit of enlightenment, and the consequences of desire and attachment.

- The text also delves into social issues such as the caste system, women's rights, and the duty of rulers towards their subjects.

- Manimekalai is known for its poetic beauty, intricate storytelling, and its ability to seamlessly blend elements of mythology, history, and philosophy.

In conclusion, Manimekalai is a significant Tamil text authored by Seethalai Satthanar during the later Sangam period. It is an epic poem that explores various themes and provides insights into the cultural, social, and philosophical aspects of ancient Tamil society.

It is Tolkapayyiam,Based on Tamil Literature..