In order to solve this you need a good equation. Since the outside 8 is never changing we can take this 8 and add it to the other outside 8 to get 16 and that will be a constant 16 no matter how many you add in this sequence. The only thing that is changing is the baces or the 4's on the bottem and on the top. Knowing this, we would put a variable on the 8 because 4 + 4 = 8
The equation would look like P = 8x + 16
Now if we plug in x for the number of rectangles then the perimiter should come out to be the same. In this case, the answer is C