What is the total number of atoms in a $BCC$ crystal lattice having $1.8 \times 10^{20}$ unit cells?
- A$9.0 \times 10^{20}$
- B$1.8 \times 10^{20}$
- C$3.6 \times 10^{20}$
- D$7.2 \times 10^{20}$
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