Which of the Following Statements About the Packing of Monatomic

Which of the following statements about the packing of monatomic solids with different unit cells is incorrect?

A) The coordination number of atoms in hcp and fcc structures is 12.
B) The coordination number of atoms in simple cubic structures is 6.
C) The coordination number of atoms in bcc structures is 8.
D) A bcc structure has a higher packing efficiency than a simple cubic structure.
E) A bcc structure has a higher packing efficiency than a fcc structure.