If the client's management refuses to give the permission to contact the previous auditor, which of the following response is appropriate?

A、Theengagementshouldhavebeenrefused.;
B、Adisclaimerofopinionshouldbeexpressed.;
C、Astatementshouldbeissuedaboutauditor'sdoubt.;
D、Theauditfeesshouldbeincreased.