Magnetic poles always exist in equal and opposite pairs (dipoles).

Isolated magnetic monopoles have never been observed in classical electromagnetic theory.

The pole strength ($m$) of each broken piece remains the same as the original, but the magnetic length becomes half ($L_{new} = L/2$).

The new magnetic dipole moment of each broken piece becomes half ($M_{new} = M/2$) when broken transversely.

Option A is incorrect because the material retains its domain alignment and intrinsic ferromagnetic magnetization.

Option B and Option C are incorrect because magnetic monopoles cannot exist isolatedly; a North pole cannot exist without a South pole.