Explanation:

The correct answer is A. Quick ratio, as it is a liquidity ratio that assesses a company's capacity to fulfill its short-term obligations using its most liquid assets.

• Option B (Operating profit margin) is incorrect because it is a profitability ratio, reflecting a company's ability to generate earnings from its operations, not its short-term liquidity.

• Option C (Days of payables outstanding) is also incorrect, as it is an activity ratio that measures the efficiency of a company's payables management, not its liquidity position.