Good points, Keith, but one should direct the extinguisher to the base of the fire. To do that effectively using a handheld you would have to be close to it (one to two metres). Not very fair options, really, and typical of the poor quality of EASA questions. If you are going to test fighting cabin upholstery fires IMHO you should test the types of extinguisher to use and where to direct the extinguishant, which is how they teach the cabin crew. The distance flows automatically because too close, you burn, too far away it doesn't work. I have never seen anyone get that wrong.