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Answer:
C. 8[tex]\pi[/tex] units
Step-by-step explanation:
The circumference is determined by the formula: [tex]C=2\pi r[/tex] , where r is the radius.
In this case, the radius is 4. So, plugging in this value, we get:
[tex]C=2\pi *4=8\pi[/tex]
Thus, the answer is C. 8[tex]\pi[/tex] units.
Hope this helps!