The correct answer is: A. 1765 AD
Dhalbhum Fort was captured by the British force in 1765 AD. The fort was located in the Dhalbhum region of present-day Jharkhand, India. It was built by the Raja of Dhalbhum in the 16th century. The fort was captured by the British East India Company in 1765 AD during the Battle of Buxar. The fort was later abandoned by the British and fell into disrepair. It was restored in the 1990s and is now a tourist attraction.
Option B is incorrect because the fort was captured by the British in 1765 AD, not 1766 AD.
Option C is incorrect because the fort was captured by the British in 1765 AD, not 1767 AD.
Option D is incorrect because the fort was captured by the British in 1765 AD, not 1780 AD.