If $b_{yx}=1.6$ and $b_{xy}=0.4$ and the angle between two regression lines is $\theta$ then $\tan \theta$ is

Question

$\begin {array} {1 1} (A)\;0.18 & \quad (B)\;0.16 \\ (C)\;0.3 & \quad (D)\;0.24 \end {array}$