The Closest-Packing of Spheres (Such as Oranges, Cannonballs, or Atoms)

Multiple Choice

The closest-packing of spheres (such as oranges, cannonballs, or atoms) has the spheres ________

A) arranged in layers with each sphere surrounded by 4 other spheres in the layer.
B) arranged in layers with each sphere surrounded by 3 other spheres in the layer.
C) arranged in a square pattern with a sphere at each corner and one in the center of the square.
D) arranged in a square pattern with a sphere at each corner of the square.
E) arranged in layers with each sphere surrounded by 6 other spheres in the layer.