To answer this question, we need to understand the context of Vandhya Devan's first visit to Thanjavore. In the novel "Ponniyin Selvan" by Kalki Krishnamurthy, Vandhya Devan is a fictional character who visits the city of Thanjavore.
During his first visit to Thanjavore, Vandhya Devan showed the gatekeeper a Muthirai Modhiram, which translates to a ring. This is represented by option A. The correct answer is option A - Muthirai Modhiram (Ring).
It is important to note that this question is specific to the novel "Ponniyin Selvan" and may not have relevance outside of this context.