Why Is the Flag in the Bottom Half of the Canvas

Why is the flag in the bottom half of the canvas of the 1965 version of Jasper Johns's Flag a solid rectangle with a black dot in the middle?

A) the artist was symbolizing the disappearance of American values
B) the painting is unfinished
C) the artist wanted the viewer to rest their eyes on this rectangle after looking at the one in the painting's top half
D) this painting is a part of series, and the red and white portions of the flag are on other paintings
E) none of the other answers