Choice "D" is correct. The auditor should ensure that those charged with governance are informed about the process used by management in formulating particularly sensitive accounting estimates and about the basis for the auditor's conclusions regarding the reasonableness of the estimates.
Choices "a", "c", and "b" are incorrect. The basis for assessing control risk, preliminary judgments about materiality levels, and the justification for performing substantive procedures at interim dates are matters of auditor judgment that need not be shared with those charged with governance.
