Option C (Average Collection Period) is correct because this ratio measures the average time taken by the firm to collect payments from its trade receivables. It directly evaluates how efficiently the firm's credit and collection policies are working. A shorter collection period indicates efficient collection, while a longer period suggests issues with credit policies or collection efforts. The context shows that when ABC Co. extends credit terms of 45 days, an average collection period of 47 days would be considered poor, demonstrating how this ratio is used to evaluate credit collection performance. In contrast, average payment period relates to paying suppliers, current ratio measures liquidity, and current asset turnover measures efficiency of asset utilization.