31. As the figure shows, a stone was thrown on the roof of height h=10 m from the throw. After 6 seconds, the stone fell on theroof at a horizontal distance d from the throw. The angle between the final flight path of the stone and the roof isθ= 60°  .Then, the horizontal distance d it travels is:
(A) 166.5 m
(B) 333.0 m
(C) 144.2 m
(D) 288.4 m
(E) 55.5 m