Correct Answer - Option 4 : 2 and 3
Concept:
Ferro Magnetic material is having the property of creating a B-H curve.
From the following options
Permalloy, Nickel and cobalt are having ferromagnetic properties.
Titanium will be having very paramagnetic properties.
Lead is having diamagnetic properties.
Therefore, titanium and lead will not show B- H characteristics.
Hence, option 4 is correct.