Which beverage has the highest concentration of alcohol in the examples given?

Answer: A — 20 oz wine cooler

Concentration means how much alcohol is in the drink relative to its volume, usually shown as the percentage of alcohol by volume. In these examples, the wine cooler is treated as having the highest percentage of alcohol per ounce among the options, so it’s considered the strongest by concentration. The other drinks are assumed to have lower percentages of alcohol per volume (or, if the same percentage were present, they don’t come in a larger volume that would raise the amount of alcohol consumed per serving). So, by comparing how much alcohol is packed into each ounce, the wine cooler comes out on top in this set.