The correct answer is: A. Nagarkot in 1621 AD
Jahangir constructed a mosque inside the fort at Nagarkot in 1621 AD. The mosque is known as the Jami Masjid and is one of the most important historical monuments in the town. It is a large, imposing building with a central dome and four smaller domes. The walls are decorated with intricate tile work and calligraphy. The mosque is still in use today and is a popular tourist destination.
Option B is incorrect because Nurpur is a town in Himachal Pradesh, India. Jahangir did not construct a mosque inside the fort at Nurpur.
Option C is incorrect because Sirmaur is a district in Himachal Pradesh, India. Jahangir did not construct a mosque inside the fort at Sirmaur.
Option D is incorrect because Bushahr is a town in Himachal Pradesh, India. Jahangir did not construct a mosque inside the fort at Bushahr.