69. Which of the following statements is false? (A) The layering in a hexagonal closest-packed structure is aba. (B) A body-centered cubic unit cell has two atoms per unit cell. (C) For unit cells having the same edge length, a simple cubic structure would have a smaller density than a body-centered cube. (D) The size of tetrahedral hole is always larger than the size of octahedral hole. (E) Atoms in a solid, consisting of only one element would have six nearest neighbors if the crystal structure was a simple cubic array.