Final answer:
An auditor does not have to assume management has assessed the effectiveness of internal controls without a written representation. The inability to obtain such a representation should be considered a scope limitation and might affect the type of opinion the auditor can issue on the financial statements. However, management is generally expected to provide this representation, irrespective of disclosure of known deficiencies.
Step-by-step explanation:
When an audit is conducted, one area of consideration is the management's assessment of the effectiveness of internal controls. If during an audit, like the one performed on Bob's Bikes by S H Associates, the auditors are unable to obtain a written representation from management about internal controls, there are various implications.
First, it is not required for an auditor to assume that management has assessed the effectiveness of internal control in the absence of a written representation. Thus, option (1) is not correct. An auditor relies on management's assertions as a basis for the audit, and if written representations are not provided, this could impact the auditor's assessment of the audit evidence and the conclusions drawn from it.
As for option (2), issuing an unqualified opinion may still be possible, but it heavily depends on the other audit evidence available and whether the lack of a written representation from management is deemed to adversely affect the auditor's ability to form an opinion on the financial statements. If the auditor concludes that there is sufficient appropriate audit evidence and the lack of written representation does not constitute a limitation, an unqualified opinion could be issued.
Regarding option (3), an auditor should indeed consider the incapacity to obtain a written representation about internal controls as a scope limitation. A scope limitation may lead the auditor to conclude that it is necessary to express a qualified opinion or disclaim an opinion if the potential effect on the financial statements could be material and pervasive.
Last, option (4) articulates that management is not obligated to provide a letter if it has disclosed all known internal control deficiencies, which is misleading. Auditors typically request a written representation from management as part of the audit process, even when all known deficiencies are disclosed, because it formally documents management's responsibility for the design and implementation of internal controls.