"Treaty of Rajpurghat" was signed on December 25, 1805 between Holkar and __________

The "Treaty of Rajpurghat" was signed on December 25, 1805, between Holkar and the British. This treaty marked an important event during the Second Anglo-Maratha War, which was a series of conflicts between the British East India Company and the Maratha Empire.

The treaty was signed between Yashwantrao Holkar, the Maratha ruler, and the British forces led by Lord Lake. The treaty resulted in the cessation of hostilities between the two sides and established terms for peace. As a result of the treaty, Holkar agreed to cede territory and pay a substantial indemnity to the British.

Therefore, the correct option is Option B: British, as the "Treaty of Rajpurghat" was signed between Holkar and the British during the Second Anglo-Maratha War.