What is likely to be a concern if a reviewer states the value opinion is inadequately supported?

When a reviewer indicates that the value opinion is inadequately supported, it suggests that there are concerns about the quality and depth of the analysis provided in the appraisal. This implies that the reasoning behind the value conclusion lacks sufficient evidence, documentation, or logical coherence. An inadequately supported value opinion raises red flags about potential significant flaws in the appraisal's methodology, data usage, or reasoning.

The reviewer's skepticism can point to issues such as insufficient data collection, inappropriate application of valuation approaches, or an oversight of relevant market conditions. In turn, these shortcomings can undermine the credibility of the appraisal and its ultimate utility for decision-making purposes. Overall, option C correctly identifies that inadequately supported value opinions are a serious concern, indicating that there may be significant flaws in the appraisal's rationale.