The correct answer is: a) Ruins of temples with intricate carvings.
Madan Kamdev is an archaeological site located in the Indian state of Assam. It is known for its ruins of temples with intricate carvings. The temples were built in the 12th century by the Kamarupa kingdom. They are dedicated to the Hindu gods Madan and Kamdev. The temples are made of sandstone and are decorated with intricate carvings of Hindu deities, animals, and flowers. The site is a popular tourist destination.
Option b) is incorrect because the Madan Kamdev archaeological site is not known for its Ahom-era fortifications. The Ahoms were a dynasty that ruled Assam from the 13th to the 18th centuries. They built many fortifications in Assam, but none of them are located at the Madan Kamdev archaeological site.
Option c) is incorrect because the Madan Kamdev archaeological site is not known for its ancient burial mounds. There are many ancient burial mounds in Assam, but none of them are located at the Madan Kamdev archaeological site.
Option d) is incorrect because the Madan Kamdev archaeological site is not known for its rock-cut caves. There are many rock-cut caves in Assam, but none of them are located at the Madan Kamdev archaeological site.