A ball is projected from ground with a velocity `V` at an angle `theta` to the vertical. On its path it makes an elastic collison with a vertical wall and returns to ground. The total time of flight of the ball is
A. `(2 upsilon sin theta)/(g)`
B. `(2 upsilon cos theta)/(g)`
C. `(upsilon sin 2 theta)/(g)`
D. `(upsilon cos theta)/(g)`