To determine which magnetic materials have negative magnetic susceptibility, we need to understand the different types of magnetic materials and their properties:

• Non-Magnetic Materials: These materials do not respond to magnetic fields and have a magnetic susceptibility close to zero. They do not have significant magnetic properties.
• Paramagnetic Materials: Paramagnetic materials have a small positive magnetic susceptibility. They are weakly attracted by external magnetic fields, which means their susceptibility is greater than zero.
• Diamagnetic Materials: Diamagnetic materials have a negative magnetic susceptibility. This means that when exposed to a magnetic field, they are weakly repelled. This is because the magnetic dipoles induced in the material oppose the applied magnetic field.
• Ferromagnetic Materials: Ferromagnetic materials have a very high magnetic susceptibility due to the alignment of magnetic domains within the material, resulting in strong attraction to magnetic fields.

Since the question specifically asks for materials with negative magnetic susceptibility, the correct answer is: