Pick up the correct statement from the following

Q. Pick up the correct statement from the following:

A.            In a gully trap, a water seal of 6 to 7.5 cm is provided

B.            The gully trap disconnects the sullage drain from the main drainage system

C.            The grating provided over gully traps is 23 cm square

D.            The gully trap collects waste water from the kitchen, sink, wash basins, etc.

Answer: The gully trap collects waste water from the kitchen, sink, wash basins, etc.