Verified Answer :

apologiabiology

remember
ab+ac=a(b+c)
if we reverse it
ba+ca=a(b+c)
so
c(m-n)+d(m-n)=(m-n)(c+d)
(c+d)(m-n)

C is answer

crazychild3

the answer is (c+b)(m-n) because m-n is on both sides of the + and so they can be added together making it easier to figure out if you have the numbers to replace the variables.

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