What is the definition of 'One Drink' in terms of beer at 4% ABV?

The definition of 'One Drink' in terms of beer, particularly when considering beverages at around 4% alcohol by volume (ABV), typically equates to a standard serving size of 12 ounces. This measurement aligns with the generally accepted standard for a single drink in the context of alcoholic beverages.

A 12-ounce serving at this ABV level contains approximately 0.6 ounces of pure alcohol, which is consistent with the definition of a standard drink. This standard forms the basis for understanding alcohol consumption guidelines and promotes safe drinking practices.

The other choices represent quantities that would equate to either less or more than this standard measure, thus not fitting the typical definition of 'One Drink.' Therefore, 12 ounces is the widely recognized serving size for a beer at 4% ABV.