The correct answer is Fort St. George.Fort St. George (historically, White Town) was built by the East India Company in 1640 in Chennai.This is considered the first fort constructed by the British in India.The construction of the fort provided the impetus for further settlements and trading activity, in what was originally an uninhabited land.The fort currently houses the Tamil Nadu legislative assembly and other official buildings.Important PointsThalassery Fort at Kannur established by the East India Company is a historical monument that stands as a testimonial of colonial rule in Kerala. Established in 1683.Mahim Fort is a fort in Mumbai. It is one of the ancient forts, which became a happening place with the entry of the colonialists into India.Sewri Fort is a fort in Mumbai built by the British in 1680 for defence.Today, it is a Grade I heritage structure that offers wonderful views of the flamingo migration at serwi mudflats.