Choice "C" is correct. A report on other comprehensive basis of accounting ("OCBOA") financial statements should include an emphasis-of-matter paragraph stating the basis, referring to the footnote that describes it, and indicating that it is a non-GAAP basis.
Choice "d" is incorrect. A report on other comprehensive basis of accounting ("OCBOA") financial statements does not include an evaluation of the usefulness of the basis of accounting.
Choice "b" is incorrect. A report on other comprehensive basis of accounting ("OCBOA") financial statements makes reference to the note in the financial statements that describes the accounting basis, not to a note describing management's responsibility.
Choice "a" is incorrect. The separate emphasis-of-matter paragraph states the basis, refers to the footnote describing it, and indicates that it is a non-GAAP basis. It does not discuss the justification for the non-GAAP basis, nor does the CPA indicate concurrence.