The answer is c because the three inter option don't have magnetic property

Understanding Magnetism
Magnets have the unique ability to attract certain materials, primarily those containing iron. Let's examine why iron is the only material among the options that responds to a magnet.

Magnetic Materials
- **Ferromagnetic Materials**: Iron is a ferromagnetic material, which means it has magnetic properties and can be magnetized. When exposed to a magnetic field, the electrons in iron align, allowing it to be attracted to magnets.

Non-Magnetic Materials
- **Wood**: Wood is an organic material and does not contain any metallic elements that respond to magnetic fields. Therefore, it remains unaffected by magnets.
- **Plastic**: Plastic is a synthetic material made from polymers. Like wood, it lacks ferromagnetic properties and does not respond to magnets.
- **Glass**: Glass, being an amorphous solid, is also non-magnetic. It does not contain iron or other ferromagnetic materials, thus it cannot be attracted to magnets.

Conclusion
In summary, the only material from the given options that is attracted to a magnet is iron. This property is due to its ferromagnetic nature, which allows it to interact with magnetic fields. Understanding these basic principles of magnetism helps us identify which materials will exhibit magnetic attraction and which will not.