Correct Answer: (c) A is true, but R is false.
Solution:Mahanadi originates from Sinhawa Hills near Dhamtari. It is the largest river of Chhattisgarh. This river is termed as the lifeline of Chhattisgarh. This river is also known as Chitrotpala or Kanaknandini. Besides, major rivers of Chhattisgarh are Shivnath, Hasado, Indravati, Arpa, Mand, Eib, Rihand, Kanhar, Shabari etc. Thus, the assertion is correct but the reason is incorrect.