Which statement is correct about the inner core and mantle of the Earth?

A: The mantle is entirely liquid, while the inner core is entirely solid.
B: The mantle is both solid and liquid, while the inner core is entirely solid
C: The mantle is both solid and liquid, while the inner core in entirely liquid
D: the mantle is entirely solid, while the inner core is entirely liquid.

C: The mantle is both solid and liquid, while the inner core is entirely liquid.