Using for loops

Now, suppose we have a 3x3 grid of pixels that is represented by a 2D list. Let’s suppose we take your red_filter_pixel() function, and apply it to each of the pixels in a 3x3 image. Which of the following nested for loops will properly produce the following result, assuming our 2D list is called img?

Here’s our initial img:

(255,128,128) (5,100,200)   (255,128,128)
(100,5,200)   (255,128,128) (100,5,200)
(255,128,128) (5,100,200)   (255,128,128)

and here is it after having the nested for loop applied:

(255,0,0)   (5,0,0) (255,0,0)
(100,0,0) (255,0,0) (100,0,0)
(255,0,0)   (5,0,0) (255,0,0)