9. The circumradius of $\triangle A B C$ is $R$, and the lines obtained by reflecting $A C$ about $A B$ and $B C$ intersect at point $K$. The radius of the incircle $\odot I$ of $\triangle A C K$ is $r$. Then ( ).
(A) $B I>2 R$
(B) $B I<2 R$
(C) $B I=2 R$
(D) $B I=R+r$