The correct answer is: C. 1809 AD
Ranjit Singh acquired the Kotla fort in 1809 AD. The fort was located in Lahore, Punjab, India. It was built by the Mughal emperor Akbar in the 16th century. Ranjit Singh was the founder and first Maharaja of the Sikh Empire. He was a powerful ruler who united the Sikh people and expanded his empire to include much of the Punjab region. The Kotla fort was an important strategic location for Ranjit Singh. It was located on the banks of the Ravi River and controlled the trade routes between Lahore and Amritsar. Ranjit Singh used the fort as a military base and a residence. He also built a number of other buildings in the fort complex, including a palace, a mosque, and a library. The Kotla fort is now a museum and a popular tourist destination.
Option A is incorrect because Ranjit Singh acquired the Kotla fort in 1809 AD, not 1805 AD.
Option B is incorrect because Ranjit Singh acquired the Kotla fort in 1809 AD, not 1806 AD.
Option D is incorrect because Ranjit Singh acquired the Kotla fort in 1809 AD, not 1811 AD.