The correct answer is: C. Third Assembly.
The first census in Haryana was held in 1961, during the third assembly of Haryana. The assembly was elected in 1957 and was in power from 1957 to 1962. The Chief Minister of Haryana during this period was Bhagwat Dayal Sharma.
The first census in Haryana was a major undertaking, and it was the first time that a comprehensive survey of the population had been conducted in the state. The census collected data on a wide range of topics, including population, age, sex, religion, education, and occupation. The data collected by the census was used to develop plans for the development of the state.
The first census in Haryana was a success, and it provided valuable data that was used to improve the lives of the people of the state. The census also helped to promote understanding and unity among the people of Haryana.
The other options are incorrect because they do not correspond to the period during which the first census in Haryana was held.