Which of the following cups holds the appropriate amount of 100 proof alcohol to equal one standard drink?

To determine which cup holds the appropriate amount of 100 proof alcohol to equal one standard drink, it's essential to understand what constitutes a standard drink. In the United States, a standard drink typically contains about 14 grams of pure alcohol. For 100 proof alcohol, which is 50% alcohol by volume, this means that you would need a smaller volume to match the pure alcohol content found in a standard drink.

Since 100 proof is at 50% alcohol by volume, you can take the standard drink measurement (14 grams of pure alcohol) and calculate the equivalent volume. To reach the equivalent of one standard drink, you would need approximately 1.5 ounces (or about 44 milliliters) of 100 proof liquor.

The correct cup must hold this volume to ensure it represents one standard drink of 100 proof alcohol. If Cup A is the option that meets this volume requirement, it correctly indicates the amount necessary for the equivalent standard drink. The other cups do not hold this amount and thus would not constitute one standard drink of 100 proof alcohol.

This understanding is vital for responsible drinking, as it emphasizes the importance of knowing alcohol content and volume to avoid overconsumption.