Proof Writing & Problem SolvingEasy ShareProof Writing & Problem Solving · Easy problemWhich sentence correctly begins a direct proof of "if nnn is even, then n2n^2n2 is even"?ALet n=2kn = 2kn=2k for some integer kkk.BAssume n2=2mn^2 = 2mn2=2m for some integer mmm.CLet n=2k+1n = 2k + 1n=2k+1 for some integer kkk.DTake n=4n = 4n=4; then n2=16n^2 = 16n2=16 is even.Check Show answer Walk through it step by step Practice more like this