The answer is A.
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In order to expand the square of the binomial, we will use the special product:
[tex]\boxed{(a-b)^2=a^2- 2ab+b^2}[/tex]
Let [tex]a=2x[/tex] and [tex]b=y.[/tex]
[tex](2x-y)^2=(2x)^2-2(2x)(y)+y^2[/tex]
[tex](2x-y)^2=(2^2)(x^2)-(4x)(y)+y^2[/tex]
[tex]\boxed{(2x-y)^2=4x^2-4xy+y^2}[/tex]
Among the choices, the answer is probably A.
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Hope it helps!
