the image given is given with the message, "is this black and blue or white and gold". the image states nothing about editing the brightness on the photo, changing the size of the photo, or anything of that matter.
the image is simply provided as-is, with no instructions on editing given.
what you are doing is changing the brightness of the photo, changing hue, and a variety of other things, thus changing the color. the image, while unedited, appears to be white and gold, but when a closer look is taken, the white appears as a very light blue. because the only choices provided were "blue and black" and "white and gold", this answers simply nothing. either you round up or down on the colors, making them lighter or darker, something that it does not state to do, or you go ahead with the incorrect answer of "gold and blue"