Comparative financial statements include the prior year's statements that were audited by a predecessor auditor whose report is not presented. If the predecessor's report was unmodified, the successor should: a. Add an emphasis-of-matter paragraph that expresses only limited assurance concerning the fair presentation of the prior year's financial statements. b. Express an opinion only on the current year's financial statements and make no reference to the prior year's financial statements. c. Indicate in an other-matter paragraph that the predecessor auditor expressed an unmodified opinion on the prior year's financial statements. d. Obtain a letter of representation from the predecessor auditor concerning any matters that might affect the successor's opinion