Correct Answer: (c) Raipur
Solution:Chhattisgarh has 5 percent of the total limestone reserve of the country. The state produced 20172 thousand tonnes limestone during the year 2012-13. Limestone is found in Raigarh, Raipur, Bastar, Bilaspur, Durg, Janjgir-Champa, Kawardha and Raj nandgaon districts of the state. Raipur produced maximum limestone (16520 thousand tonnes).