Answer:
Metals can become magnetic if they have many spinning electrons that create magnetic fields.
Step-by-step explanation:
When metals are placed in external magnetic field then due to this external magnetic field the spinning electrons will experience torque on them and all the electrons aligns in such a way that the magnetic field produced due to spinning electrons are all in the same direction and they all combine to give a strong field due to all spinning electrons
This phenomenon of magnetic field production of electrons due to alignment of all spinning electrons is known as magnetism.
So here correct answer will be
Metals can become magnetic if they have many spinning electrons that create magnetic fields.