If the magnetizing field on a ferromagnetic material is increased, its permeability?

Correct option is A. Decreased
We know that,A ferromagnetic material, such as iron, does not have a constant relative permeability. As the magnetizing field increases, the relative permeability increases, reaches a maximum and then decreases.
Formula of the permeability is
μ=B/H
Where,
B= magnetic field density
H= magnetic field strength
The magnetic field strength is inversely proportional to the permeability.
So, The magnetizing field increases then the permeability decreases.
Hence, A is correct option.