Choice "A" is correct. An auditor most likely would analyze inventory turnover rates to obtain evidence concerning management's assertions about valuation and allocation (i.e., if the inventory is becoming older, an obsolescence reserve might be required).
Choice "b" is incorrect. The existence assertion addresses whether assets, liabilities, and equity interests exist. Analysis of inventory turnover would not provide evidence concerning this assertion.
Choice "d" is incorrect. Rights and obligations pertain to ownership of assets and liabilities. Analysis of inventory turnover would not provide evidence concerning this assertion.
Choice "c" is incorrect. Understandability and classification deal with whether the components of the financial statements are properly presented, described, and disclosed. Analysis of inventory turnover would not provide evidence concerning this assertion.