The Space-Filling Representation of a Crystalline Potassium Provided Below Is

The space-filling representation of a crystalline potassium provided below is an example of a _____ unit cell,which contains the equivalent of _____ atom(s) within a single unit cell.
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A) body centered cubic,2 atoms
B) face centered cubic,4 atoms
C) simple cubic,1 atom
D) body centered cubic,4 atoms
E) face centered cubic,5 atoms