The answer is (b): before the water comes out of the bottom end the water will overflow the funnel, as seen in the photograph at the left below and in a short video. The video shows water being poured intothe top end until it overflows, when the camera then moves to view the lower end of the tube. You may view the video in any of several formats by clicking your mouse on your selection below:
Why this happens can be seen by referring to the photograph at the right above. In the coiled tube, air is confined as the water eases over the high point in each turn to fill the tube on both sides of the high point. When the air is confined, the pressure in the confined volume is increased by an amount equal to the height of the water column. Each turn then has increased pressure in the confined air. Thus the vertical end can rise to a height equal to the sum of the additional heads of each coil - approximately three (the number of coils) times the diameter of the coil, in this case.
