Correct Option: C

Wells are the principal source of irrigation in Tamilnadu. During the year under review, open wells and tube-wells/ bore-wells continued to be the principal source of irrigation. The net area irrigated by open wells and tube-wells/ bore-wells together accounted for 1593968 ha (about 55.7% of the total net area irrigated ) in 09-10 as against 1614082 ha in 08-09 showing a decrease of 20114 ha i.e. 1.2%. The net area irrigated by wells during the year 09-10 was the highest in Villupuram district with 11.3% of the total net area irrigated by the wells in the state followed by 7.7% in Thiruvannamalai district and 6.4% in Salem district.