- (a) Rudrasagar lake is a Ramsar site located in Tripura. This matches with (iii). - (b) Harike lake is a Ramsar site located at the confluence of the Beas and Sutlej rivers in Punjab. This matches with (i). - (c) Deepor Beel is a Ramsar site located near Guwahati in Assam. This matches with (ii). - (d) Vembanad wetland (specifically Vembanad-Kol Wetland) is a Ramsar site located in Kerala. This matches with (iv). - The correct match is (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv). Option C provides this sequence.