Factor Completely $49 k^{2}-9 m^{2}$ A) $(7 \mathrm{k}+3 \mathrm{~m})^{2}$ B) $(49 k+m)(k-9 m)$

Multiple Choice

Factor completely. If the polynomial cannot be factored, write "prime."
- $49 k^{2}-9 m^{2}$

A) $(7 \mathrm{k}+3 \mathrm{~m}) ^{2}$
B) $(49 k+m) (k-9 m)$
C) $(7 \mathrm{k}+3 \mathrm{~m}) (7 \mathrm{k}-3 \mathrm{~m})$
D) $(7 \mathrm{k}-3 \mathrm{~m}) ^{2}$