I believe that your answer would be C) 432 units². To do this, I multiplied 6 by 6 to get the first area of 36. Since there is another area that is this exact same size, I multiplied it by 2 to get 72. Next, I multiplied 6 by 15 to find the area of the larger rectangles to get 90. Since there are 4 of those larger rectangles, I multiplied 90 by 4 to get 360. Lastly, I added 72 to 360 to get 432. I hope I helped you! :)