What is a report not? A. Investigation report, accurate and objective B. Written or oral message C. Opinion based and objective D. Result of an investigation

To determine what a report is not, let's evaluate the provided options:

1. Investigation report, accurate and objective: This option describes a report that is based on factual findings and maintains objectivity, which aligns with the general purpose of reports.

2. Written or oral message: This is a broad definition of communication methods. A report can indeed be a written or oral message but does not characterize the specific nature of a report, making it somewhat ambiguous.

3. Opinion based and objective: This option contrasts terms that are not typically compatible. Reports should be objective, and while they can include interpretations, being "opinion-based" is not a defining characteristic of a report. Thus, this suggests a mismatch.

4. Result of an investigation: This aligns with what reports are meant to present; they usually convey findings from an investigation or research.

Final Answer

Therefore, the best answer is C. Opinion based and objective, as reports are meant to be objective rather than opinion-based.