Answer: Option C
We will factor 16 so that the sum of the factors is 8.
Such factors are 4 and 4.
So the factorization of the given expression is:
[tex]y^2+8y+16\\=y^2+4y+4y+16\\=y(y+4)+4(y+4)\\=(y+4)(y+4)\\=(y+4)^2[/tex]
So the given trinomial is a perfect square trinomial.
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