Verified Answer :

apologiabiology

difference of 2 perfect squares
a^2-b^2=(a+b)(a-b)
(2b)^2-4^2=(2b-4)(2b+4)
(2b-4)=2(b-2)
(2b+4)=2(b+2)
2(b-2)2(b+2)
4(b-2)(b+2)

C is answer

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