y^{2} – 9

A; is a difference of squares: (y + 3)(y – 3)

B;is a difference of squares: (y + 3)^{2}

C;is not a difference of squares

D;is a difference of squares: (y – 3)^{2}

Answer is A : is a difference of squares: (y + 3)(y – 3)

Factors are (y + 3)(y – 3)

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