Who will have a higher BAC, a guest who is drinking a 2-ounce martini, or a guest drinking a 12-ounce beer?

A standard drink is defined as 0.6 fluid ounces (fl oz) of pure alcohol. A 2-ounce martini typically contains 1.5 ounces of alcohol, while a 12-ounce beer typically contains 0.6 ounces of alcohol. This means that the martini contains 2.5 times more alcohol than the beer.
Even though the martini is smaller in volume, it contains more alcohol and will therefore produce a higher BAC.
It is important to note that everyone's body metabolizes alcohol differently, so the exact BAC of each guest will vary depending on their individual factors, such as weight, gender, and food intake. However, in general, the guest drinking the martini will have a higher BAC than the guest drinking the beer.