If the PSCO from general impressions or observations on board has（）for believing that the ship，its equipment or its crew do not substantially meet the requirements，the PSCO should proceed to a more detailed inspection.

A.increases
B.remains the same
C.decreases
D.is unimportant and may be neglected

A.By backing down the track and cutting out ice on either bow
B.By approaching from the stern and crossing ahead at an angle of 20°to 30°to the beset ship's course
C.By overtaking the beset ship，running ahead and then backing down the track to the beset vessel
D.By approaching the vessel from astern and towing the beset vessel stern first