Answer:
the figure on the top left
Step-by-step explanation:
Hey There!
If figure a was going to be dilated by a scale factor of 3 you would have to multiply all of its dimensions by 3
the top length would be 6
the bottom length would be 9
the right side length would be 12
and the left side length would be 9
The first figure has all of these dimensions thus it is correct answer
