How many unit cells are present in $100 \ g$ of an element with $fcc$ crystal structure having density $10 \ g/cm^{3}$ and edge length $100 \ pm$?
- A$3 \times 10^{25}$
- B$2 \times 10^{25}$
- C$4 \times 10^{25}$
- D$1 \times 10^{25}$
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