Two balls A and B are thrown with speeds u and u/2 respectively. Both the balls cover the same horizontal distance before returning to the plane of projection. If the angle of projection of ball B is 15^{°} with the horizontal, then the angle of projection of A is :

(A) (1/2) sin^{-1} (1/8)

(B) (1/4) sin^{-1} (1/8)

(C) (1/3) sin^{-1} (1/8)

(D) sin^{-1} (1/8)