Choice "C" is correct. The auditor has no active responsibility to make continuing inquiries between the date of the auditor's report and the date on which the report is submitted. The auditor's active responsibility stops on the date of the auditor's report.
Choice "a" is incorrect. The auditor does have an active responsibility to make continuing inquiries between the date of the financial statements and the date of the auditor's report.
Choice "b" is incorrect. The auditor does have an active responsibility to make continuing inquiries between the date of the financial statements and the date on which sufficient appropriate audit evidence has been obtained.
Choice "d" is incorrect. The auditor has no active responsibility to make continuing inquiries after the date of the auditor's report.