Which of the following constitutes misrepresentation according to Standard I(C)?

Misrepresentation according to Standard I(C) addresses the ethical obligation of individuals to ensure that the information they present is accurate and properly attributed. When data is used without proper citation or attribution, it can lead to the belief that the work is original or valid without acknowledging the sources behind the claims.

In this context, the option involving unattributed data in a client report exemplifies misrepresentation directly. This entails presenting information without acknowledging where it comes from, which gives the misleading impression that the presenter owns the intellectual property or has accurately represented the findings. This violation not only undermines the integrity of the report but could also lead to the dissemination of misinformation.

While omitting sources and caveats from statistics, using excerpts without citation, and paraphrasing without credit may involve issues of ethical sourcing and representation, the most clear-cut example of misrepresentation aligns directly with the lack of attribution in a professional document. Each of these actions could potentially mislead but do not necessarily constitute misrepresentation to the same extent as presenting unattributed data.