Refer to the Figure

Refer to the figure.
These findings about the male red-collared widowbird's tail length and red collar show that

A) a male's red collar area and tail length are unrelated.
B) resident males have a longer tail but a smaller red collar area than floater males.
C) males with a larger red collar area also have a shorter tail length.
D) as a male's tail length increases, his red collar area also increases.