Which is the FOURTH sentence of the paragraph?

e d a c f b Mamallapuram, a town on India’s southern Coromandel Coast, was a thriving seaport as far back as the 1st century A.D. - INTRODUCTION of the town When the kings of the eighth-century Pallava Dynasty established their capital in nearby Kanchipuram, this seaport (the one already mentioned) became one of the richest in India. It also became a center of divine architecture and sculpture. - Additional information about the already mentioned seaport. PROOF? Spectacular remnants of this artistic heyday (referred to the seaport, artistic heyday means when art was at the peak here) are scattered around what is now a charming, laid-back seaside fishing village strewn with giant boulders and palm trees. About the SPECTACULAR REMNANTS Among them (among the already mentioned spectacular remnants) are ancient carved cave temples featuring fascinating timeless vignettes of everyday local life from 1300 years ago, and artists’ workshops where traditional methods of sculpture and carving still thrive. More about/ existing example of sculpture and carving (as mentioned in the sentence just before this) One of the biggest boulders is inscribed with extraordinarily well-preserved intricate relief carvings known as “The Descent of the Ganga”, an illustration of Hindu mythology featuring celestial beings, elephants, and mythical Naga snakes.