A Tetrahedral Hole in a Crystal Lattice Is Defined as

A tetrahedral hole in a crystal lattice is defined as

A) one-half of an octahedral hole.
B) the space between any number of atoms having tetrahedral edges.
C) the space between a cage of sp3 hybridized atoms such as in diamond.
D) the space between a cluster of four adjacent atoms arranged in a tetrahedron.
E) a large hole having four flat sides arranged in a tetrahedral shape.