Two non-mixing liquids of densities p and np (n> 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length pL(p < 1) in the denser liquid. The density d is equal to : [2016] (a) {1+ (n + 1)p}p (b) {2+ (n + 1)p}p (c) {2+ (n-1)p}p (d) {1+ (n-1)p}p