which of the following best describes this graph

x² - 4x + 4 is the graphed parabola, so the correct option is D.
On the graph, we can see a parabola that opens upwards (then the leading coefficient is positive), and has a vertex at the point (2, 0).
Also, we can see that the y-intercept is y = 4, that means that the constant term of the parabola is 4.
The only option with a constant term equal to 4 is the last option:
y = (x - 2)*(x - 2) = x² - 4x + 4
So that is the graphed parabola.
If you want to learn more about parabolas:
https://brainly.com/question/4061870
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