A vessel emitting harmful substances into the air or spilling oil into the sea is a（）.

A.discharge of ballast or cleaning water from fuel tanks
B.sounding levels of all fuel tanks on a daily basis
C.the grade and specific gravity of all fuel oil carried
D.fuel consumption rates on a weekly basis

A.one year
B.two years
C.three years
D.four years

A.has financial backing to meet any liability resulting from the discharge of oil
B.has the minimum required amount of P & I and hull insurance
C.will assume the responsibility for any damage or loss to the shipper
D.has financial reserves to meet reasonable expected crew costs of an intended voyage