Which of the following is a function of financial statement analysis?

Financial statement analysis primarily involves examining and interpreting a company's financial data to assess its performance and financial health. The key function of reviewing asset valuation is crucial in this context since it helps stakeholders understand the worth of the company's assets, which is an integral aspect of its overall financial condition. This analysis enables investors, creditors, and management to make informed decisions based on accurate valuations of assets, liabilities, and shareholder equity.

By evaluating asset valuation, analysts can determine whether the company's assets are overvalued or undervalued, which can influence investment strategies and financial reporting decisions. Factors such as market conditions, depreciation, and asset impairments are all considered when conducting a thorough analysis.

Other options relate to functions that, while important, do not fall under the scope of financial statement analysis. Marketing product features focuses on promoting products to consumers, conducting employee performance reviews pertains to internal HR functions, and improving customer service is aimed at enhancing customer interactions. These activities, while essential for business operations, do not involve analyzing financial documents or assessing the company's financial performance. Therefore, the correct function related to financial statement analysis is indeed the review of asset valuation.