Largest layer of earth that makes up most of the earths mass. A:crust B:mantle. C:outer core. B:inner core

Mantle is the answer

Explanation:

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the mantle is the thickest layer, while the crust is the thinnest layer.

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