Which Layer of the Planet Forms 80 Percent of Earth's $\mathrm{cm}^{3}$

Multiple Choice

Which layer of the planet forms 80 percent of Earth's total volume,and has an average density of 4.5 grams per $\mathrm{cm}^{3}$ ?

A) continental crust
B) oceanic crust
C) mantle
D) core
E) lithosphere