The  area of  B-H hysteresis loop is an indication of the

Key (1) Retentivity  is defined as the intensity of magnetisation remaining in the substance when the magnetizing field has been reduced to zero. Hence key (1) is not correct.Key(2) Magnetic susceptibility is the ratio of magnetic moment to unit volume but it is not energy dissipation (loss) in cycle hence key(2) is not correct.Key (4) permeability is the property which allows magnetic lines of force to pass through it so it is not energy dissipation in cycle hence key (4) is not correct.