The correct answer is: A. Elephant
The elephant was the royal symbol of the kings of ancient Kamrupa. It was a symbol of power, strength, and wisdom. The elephant was also associated with the god Indra, who was the king of the gods.
The elephant was a popular motif in the art and architecture of ancient Kamrupa. It was often depicted on coins, seals, and sculptures. The elephant was also used as a mount by the kings of ancient Kamrupa.
The elephant is still a popular symbol in Assam today. It is the state animal of Assam and is often used in the state’s art and architecture. The elephant is also a popular tourist attraction in Assam.
The other options are incorrect because they are not associated with the kings of ancient Kamrupa. The lion is the royal symbol of the kings of ancient India, the tiger is the royal symbol of the kings of ancient Thailand, and the rhinoceros is not associated with any particular kingdom.