Who was the last ruler of Dev dynasty?

Answer: Option A

The last ruler of the Dev dynasty was Jit Singh.

Raja Braj Raj Dev was killed during the Sikh invasion of Jammu in 1787. His infant son, Raja Sampuran Singh, succeeded him but only ruled as an autonomous tributary under the Sikh Confederacy Misls until 1797.

After Raja Sampuran Singh, Raja Jit Singh became the ruler. During Jit Singh's rule, the Dev dynasty finally came to an end, and Jammu came under the control of the Sikh Empire.

Thus, the correct answer is that the Dev dynasty ended with Raja Jit Singh.

Rulers of Jammu	Reign
Raja Dhruv Dev	1703 – 1728
Raja Ranjit Dev	1728 – 1780
Raja Braj Dev	1780 – 1787
Raja Sampuran Singh	1787 – 1797
Raja Jit Singh	1797 – 1808
Direct Sikh Rule	1808 – 1820
Raja Kishore Singh	1820 – 1822
Raja Gulab Singh	1822 – 1846