What is the standard measure for 'One Drink' of hard liquor at 40% ABV?

A standard measure for 'One Drink' of hard liquor, typically defined at 40% alcohol by volume (ABV), is 1 to 1.5 ounces. This measurement is widely recognized and used in many contexts, including bars and restaurants, to ensure that a single serving is consistent and manageable in terms of both alcohol content and overall consumption.

This standard is based on the understanding that 1.5 ounces of liquor at 40% ABV contains approximately the same amount of pure alcohol as a 12-ounce beer at about 5% ABV or a 5-ounce glass of wine at approximately 12% ABV. By establishing this consistency among different types of alcoholic beverages, it helps consumers track their alcohol intake more accurately, which is important for responsible drinking.

The other options either suggest serving sizes that exceed the norm or fall below the standard measurement, which could lead to inconsistencies in alcohol content and consumption guidelines.