Final answer:
c. random. The magnetic domains in a non-magnetized piece of iron are characterized by random orientation. In an unmagnetized iron, the domains have no net alignment and are randomly oriented.
Step-by-step explanation:
The magnetic domains in a non-magnetized piece of iron are characterized by c. random orientation. In an unmagnetized piece of iron, the magnetic domains have no net alignment and are randomly oriented. Each domain contains individual atoms that act like tiny bar magnets with their own magnetic dipole moments. When the iron is magnetized by an external magnetic field, the domains start to align somewhat with the field, resulting in greater magnetic alignment and the growth of some domains at the expense of others. When magnetized by an external field, the domains align somewhat with the field and grow at the expense of others.