If an Atomic Nucleus Containing 64 Nucleons Has a Mass $\rho$

If an atomic nucleus containing 64 nucleons has a mass density $\rho$ , what will be the expected mass density of a nucleus containing 512 nucleons?

A) $8 \rho$
B) $16 \rho$
C) $\rho$
D) $4 \rho$
E) $2 \rho$