Which of the Following Statements Is (Are)false

Which of the following statements is (are) false?
I.The layering in a hexagonal closest-packed structure is aba.
II.A body-centered cubic unit cell has four atoms per unit cell.
III.For unit cells having the same edge length,a simple cubic structure would have a smaller density than a body-centered cube.
IV.Atoms in a solid consisting of only one element would have six nearest neighbors if the crystal structure were a simple cubic array.

A) I
B) II
C) II,III
D) I,IV
E) II,III,IV