Answer (A) is correct. The quick (acid test) ratio equals the quick assets (cash, marketable securities, and accounts receivable) divided by current liabilities. The current ratio is equal to current assets divided by current liabilities. The sale of inventory (not a quick current asset) on account increases accounts receivable (a quick asset), thereby changing the quick ratio. The sale of inventory on account, however, replaces one current asset with another, and the current ratio is unaffected.