______ therefore is an activity aimed at moving the burden of risk from the shoulders of the exporters and importers，and placing it upon the shoulders of specialist risk-bearing underwriters.

______ therefore is an activity aimed at moving the burden of risk from the shoulders of the exporters and importers，and placing it upon the shoulders of specialist risk-bearing underwriters.

A.Cargo insurance

B.Marine insurance

C.Life insurance

D.Accident insurance

正确答案是A