Accounting methods influence reported financial results and, consequently, financial ratios. Differences in depreciation methods, inventory valuation (FIFO vs. LIFO), revenue recognition, and expense capitalization can significantly alter earnings, assets, and equity. When analysts compare ratios across firms or over time, failure to account for these differences can lead to incorrect conclusions about profitability, efficiency, or risk. Financial management emphasizes adjusting or at least recognizing accounting differences to improve comparability and interpret ratios accurately. Option A correctly explains why caution is required, while the remaining options incorrectly assume uniformity or rigidity in accounting practices.