Analyze the image below and answer the question that follows. A cross-sectional view of the Earth to show the 4 layers. An arrow points to the second layer.
Image by Mats Halldin and Charles C.

In the image above, the arrow is pointing to a layer of the Earth that has constantly moving currents. Which of the Earth’s layers is the arrow pointing to?
A.
the crust
B.
the mantle
C.
the inner core
D.
the outer core