Pick up the correct statement from the following:
(A) Yield of a drainage basin is the run off at any time
(B) Yield of a drainage basin is the run off over long periods
(C) Yield of a drainage basin is expressed as surface run off per year
(A) Yield of a drainage basin is the run off at any time
(B) Yield of a drainage basin is the run off over long periods
(C) Yield of a drainage basin is expressed as surface run off per year