Answer:
The answer depends on what you are taking about: the outer core or the inner core?
Answer: Mantle
Step-by-step explanation:
If you find a picture of the Earth's layers, you can see that the inner core is the bottommost layer. However, if you combine the Inner Core and Outer Core, that could be determined as the Earth's core.
I would chose the Mantle because if the two cores are combined, the layer directly above them is the Mantle.