Floating gardening is very much common in . . . . . . . . state.

Answer: Option D

Floating gardening is very much common in Jammu and Kashmir.
A planting on soil buoyed up (as on the surface of a lake) by rafts of interlaced branches or other floating support is found chiefly in the Mexico City area and parts of Kashmir.
Islands or floating gardens on the Dal Lake in Kashmir are formed from the weeds, after collecting them from the lake itself. Such weeds mostly consist of Typha augustata and Phragmites communis which are in the Kashmiri language known as Pech and Nargasa, respectively.