Perfect-square trinomials are of the form:
[tex]a^2x^2 \pm 2axb + b^2[/tex]
and are expressed in squared-binomial form as: [tex](ax \pm b)^2.[/tex]
The only possible choice for squared-binomial form is
[tex](3x-5)(3x-5)=(3x-5)^2.[/tex]
Answer: correct choice is A.