The correct answer is Bettiah Raj.
Bettiah Raj was a princely state in the Indian subcontinent, which existed from the 17th century to 1947. It was located in the present-day state of Bihar, India. The rulers of Bettiah Raj controlled major indigo plantations, which caused conflicts with cultivators.
The indigo plantations were established in Bettiah Raj in the 18th century. The planters were British and they forced the cultivators to grow indigo on their land. The cultivators were paid very little for their labor and they were often subjected to harsh treatment by the planters.
The conflicts between the planters and the cultivators led to a number of uprisings in Bettiah Raj. The most famous of these uprisings was the Bettiah Indigo Revolt of 1860. The revolt was led by a peasant named Birsa Munda. The revolt was suppressed by the British, but it led to some reforms in the indigo plantation system.
The indigo plantations were finally abolished in Bettiah Raj in 1917. The abolition of the indigo plantations led to the decline of Bettiah Raj. The state was finally merged with the Indian Union in 1947.
The other options are incorrect.
Ramgarh Raj was a princely state in the Indian subcontinent, which existed from the 16th century to 1947. It was located in the present-day state of Jharkhand, India. The rulers of Ramgarh Raj did not control major indigo plantations.
Deo Raj was a princely state in the Indian subcontinent, which existed from the 17th century to 1947. It was located in the present-day state of Bihar, India. The rulers of Deo Raj did not control major indigo plantations.
Kharagpur Raj was a princely state in the Indian subcontinent, which existed from the 17th century to 1947. It was located in the present-day state of West Bengal, India. The rulers of Kharagpur Raj did not control major indigo plantations.