The correct answer is A. Sirsa.
The SC population in Sirsa district is 17.2%, which is the lowest among all the districts in Haryana. The SC population in Mewat district is 22.1%, Bhiwani district is 22.6%, and Hisar district is 23.1%.
The SC population in Haryana is 20.6%, which is higher than the national average of 16.6%. The SC population in Haryana is concentrated in the southern and western parts of the state. The districts with the highest SC population are Mewat, Bhiwani, Hisar, and Gurgaon.
The SC population in Haryana has been increasing over the years. In 1961, the SC population in Haryana was 13.8%. In 1991, the SC population in Haryana was 17.4%. In 2001, the SC population in Haryana was 19.2%. In 2011, the SC population in Haryana was 20.6%.
The increase in the SC population in Haryana is due to a number of factors, including natural increase, migration, and the implementation of affirmative action policies.