A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is

A short tube mouthpiece will not run full at its outlet if the head un

1.	A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is
A.	less than 12.2 m of the water
B.	more than 12.2 m of the water
C.	equal of 12.2 m of water
D.	none of these.
Answer» C. equal of 12.2 m of water