Answer:
The correct answer would be the inner core.
The inner core is the innermost region of the earth which is solid in nature and is made up of the iron-nickel alloy.
The estimated radius of this solid ball is around 1220 kilometers.
Due to its solid nature, the density is estimated around 13 grams per cubic centimeter.
The temperature of this region is similar to that of the surface of the sun.
It is believed that the flow of molten alloys (present in outer core) around the inner core creates the magnetic field of the earth.
