Water coming out of the mouth of a tap and falling vertically in stream line flow forms a tapering column. i.e., the area of cross-section of the liquid column decreases as it moves down which of the following is the most accurate explanation for this-

Options

A. As the water move down, its speed increases and hence its presence decreases. It is then compressed by the atmosphere.
B. Falling water tries to each a terminal velocity and hence reduces the area of cross-section to balance upward and downward forces.
C. The mass of water flowing past any cross-section must remain constant. Also, water is almost incompressible. Hence, the rate of volume flow must remain constant. As this is equal to velocity `xx` area, the decreases as velocity increases.
D. The surface tension causes the exposed surface area of the liquid to decrease continuously.

Answer

C