To answer this question, you need to know the author of the epic Tamil poem Manimekalai.
Option A) Ilango Adigal - This option is incorrect because Ilango Adigal is the author of another Tamil epic poem called Silappatikaram.
Option B) Seethalai Sathanaar - This option is correct. Seethalai Sathanaar is the author of Manimekalai.
Option C) Kaunthi Adigal - This option is incorrect. There is no known author named Kaunthi Adigal associated with Manimekalai.
Option D) Adhithanaar - This option is incorrect. Adhithanaar is not the author of Manimekalai.
The correct answer is Option B) Seethalai Sathanaar. Seethalai Sathanaar is the author of Manimekalai.