A room is 15 meters long, 12 meters wide & 10 meters in heig

A room is 15 meters long, 12 meters wide & 10 meters in height. The longest possible rod which can be placed in the room is

A: 19.13 meters

B: 20.22 meters

C: 21.65 meters

D: 22.34 meters

E: 23.32 meters

Source: CMAT Preparation