Which one of the following equations has a root in common with $m^2+4m+4=0?$

Which one of the following equations has a root in common with $m^2+4m+4=0?$

A. $m^2-4m+4=0$

B. $m^2+4m+3=0$

C. $m^2-4=0$

D. $m^2+m-6=0$

E. $m^2+5m+4=0$

Answer: C

Source: Princeton Review

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