The correct answer is: Baroda.
Baroda was a princely state in India that existed from the 18th century until 1948. It was ruled by the Gaekwad dynasty, who were Maratha Brahmins. The state had a population of over 3 million people and a land area of over 20,000 square kilometers.
In 1948, Baroda was merged with the Bombay State. This was part of the process of Indian independence, when the British Indian Empire was divided into two independent countries: India and Pakistan. The princely states were given the choice of joining either India or Pakistan, or remaining independent. Baroda chose to join India.
The merger of Baroda with Bombay State was a complex process. The Gaekwad dynasty was initially reluctant to give up their power, but they were eventually persuaded to do so. The merger was completed in 1949.
The merger of Baroda with Bombay State had a significant impact on the region. It led to the creation of a large and powerful state that was able to play a major role in the development of India. It also led to the integration of the princely states into the Indian Union.
The other options are incorrect because they were not merged with Bombay State in 1948. Rajpipla was merged with Saurashtra State, Idar was merged with Gujarat State, and Junagadh was merged with Bombay State in 1949.