Answer:
C, the two rounded rectangles
Step-by-step explanation:
Isometry can be divided into two words: iso = same and metry = measure
So, isometry means "same measure".
In this case, that means the transformation didn't change the measures of the object.
In A and B, you can see the figure has been transformed, while in C, it's the same shape and size, just a different color.
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