Which of the following statements is true-

Options

A. in hexagonal close-packed arrangement of spheres, the spheres of the first and fourth layers have the same vertical alignment
B. in cubic close-packed arrangement of spheres, the sphere of the first and third laters have the same vertical alignment
C. in cubic close-packed structure, the fifth layer repeats the second layer
D. hexagonal arrangement in three dimensions is less closely-packed than the cubic arrangement

Answer

C