What is a characteristic of trend analysis?

Trend analysis compares financial statement items or ratios over several periods to identify patterns in a company’s performance. A major limitation is that the selected base period must be representative. If the base year is abnormal because of recession, restructuring, one-time gains, losses, or unusual operating conditions, later comparisons can be misleading. Option B is too restrictive because trend analysis can support both internal historical review and broader analysis when used carefully. Option C is not the defining characteristic; both trend ratios and percentage changes can be useful depending on context. Option D is incorrect because a loss in the base year can make percentage-based trend calculations unreliable or meaningless. Therefore, the best characteristic is the warning about an unrepresentative base period.