单项选择题

TheSafetyManagementCertificateshouldbeissuedtoashipforaperiodwhichshouldnotexceed()yearsbytheAdministrationoranorganizationrecognizedbytheAdministrationor,attherequestoftheAdministration,byanotherContractingGovernment.

A.five
B. six
C. seven
D. eight