The Dhar Dynasty in Jammu was taken over by which dynasty in 840 AD?

The correct answer is: A. Rai dynasty

The Rai dynasty was a Hindu dynasty that ruled over Jammu from the 8th to the 11th centuries. They were founded by Raja Dhruv Dhar, who was a descendant of the Pandavas of the Mahabharata. The Rai dynasty was a powerful and prosperous dynasty, and they built many temples and other monuments in Jammu. They were eventually overthrown by the Ghaznavid Turks in the 11th century.

The other options are incorrect because:

• The Dev dynasty was a Hindu dynasty that ruled over Kashmir from the 8th to the 11th centuries.
• The Utpala dynasty was a Buddhist dynasty that ruled over Kashmir from the 8th to the 10th centuries.
• The Lahore dynasty was a Muslim dynasty that ruled over Punjab from the 11th to the 13th centuries.