Every chart is liable to be incomplete（）.
题型：单项选择题
问题：
Every chart is liable to be incomplete（）.
A.the final judge of the reliance the mariner can place on the information given
B.its immediate importance cannot always be verified before promulgation
C.through imperfections in the survey on which it is based，or subsequent alterations to the topography or sea floor
D.deferring the promulgation of certain less important information
