An auditor who uses the work of an auditor's external specialist may refer to the specialist in the auditor's report if the: A. Auditor's use of the specialist's findings is different from that of prior years.
B. Specialist's findings provide the auditor greater assurance of reliability about management's representations.
C. Reference is needed for an understanding of a modification of the opinion.
D. The specialist's findings fully corroborate management's financial statement assertions.

Option C

Explanation:

In simple words, The auditor can appeal to an external expert of the inspector only if the judgment has been changed. A changed opinion shall be a competent opinion, an negative judgment or a waiver of view. Link is established as it's important to the interpretation of the change. The opinion of the auditor for such a reference would note that it will not diminish the liability of the auditor.

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