(D) In a closed packed array of $N$ spheres,the number of tetrahedral voids (holes) is $2N$ and the number of octahedral voids is $N$. For example,an

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(D) In a closed packed array of $N$ spheres,the number of tetrahedral voids (holes) is $2N$ and the number of octahedral voids is $N$. For example,an $fcc$ unit cell has $4$ atoms per unit cell. It contains $4$ octahedral voids and $8$ tetrahedral voids,which follows the $N$ and $2N$ relationship respectively.