The correct answer is: A. Goa
Aguada Fort is a 16th-century Portuguese fort located in the state of Goa, India. It is one of the most popular tourist attractions in Goa and is a UNESCO World Heritage Site. The fort was built in 1540 by the Portuguese to protect the city of Goa from attack. It is a large fort with a moat, ramparts, and several towers. The fort is now a museum and is open to the public.
Option B, Assam, is incorrect because Aguada Fort is not located in Assam. Assam is a state in northeastern India. It is the largest state in India by area and the 13th most populous state. The capital of Assam is Guwahati.
Option C, Manipur, is incorrect because Aguada Fort is not located in Manipur. Manipur is a state in northeastern India. It is the 20th most populous state in India. The capital of Manipur is Imphal.
Option D, Tripura, is incorrect because Aguada Fort is not located in Tripura. Tripura is a state in northeastern India. It is the 23rd most populous state in India. The capital of Tripura is Agartala.