A uniform wooden stick of density d is completely immersed in water of density D(D > d). One end of the stick is free to rotate about a hinge which is attached to a wall of the container. In the position of equilibrium the stick makes an angle θ with the vertical. Then, tan θ is equal to
(a) 0
(b) d/D
(c) 1 - d/D
(d) D/d
