Select the correct answer. An example of a natural magnet is.
A.Iron
B.Steal
C.Lodestone
D.None of the above

Hint: Natural magnet has its tendency to attract objects like iron, cobalt, etc.
In an artificial magnet, electromagnet strength can be changed by various parameters like the number of turns of the coil.
Natural magnets have fixed strength and the artificial magnet's strength can be changed.

Complete answer:
A naturally magnetized piece of mineral magnetite is called a lodestone. They are called natural magnets, and they can attract iron. The magnetism property was first discovered in antiquity via lodestones. in which the Middle English refers to the "course stone" or "leading stone"
Artificial magnets are stronger than naturally occurring magnets like lodestone.
Again artificial magnets are classified into two types, permanent magnets, and electromagnets.
Permanent magnets are made of carbon steel or different metal alloys like AlNiCo which is an alloy of Aluminium, Nickel, and Cobalt; or even a nonmetal like a ferrite which can be very strongly magnetized.
Electromagnets have low carbon steel or special alloys of steel it have a coil of current-carrying material wrapped around them

Finally, Option (C) is the correct answer. The natural magnet is lodestone.

Note:
Natural magnets are substances that have magnetic properties naturally.
By rubbing natural magnets on iron and steel the artificial magnets are made.
Artificial magnets are always preferred rather than natural magnets because they can be made powerful according to our requirement