How much alcohol is approximately contained in a five-ounce glass of wine, a 12-ounce can of beer, and one ounce of 90-proof liquor?

A five-ounce glass of wine, a 12-ounce can of beer, and one ounce of 90-proof liquor all contain approximately the same amount of alcohol, which is about 0.5 ounces of pure alcohol.

Here's how that works out: wine typically has an alcohol by volume (ABV) of around 12-14%, which means that in a five-ounce serving, there is roughly 0.6 ounces of alcohol. A 12-ounce beer usually has an ABV of about 4-6%, which equates to approximately 0.5 ounces of alcohol. Meanwhile, 90-proof liquor has an ABV of 45%, meaning that one ounce of it contains about 0.45 ounces of alcohol.

These common serving sizes illustrate the concept of "standard drinks," where a standard drink in the U.S. is defined as containing approximately the same amount of pure alcohol, around 0.6 ounces. Thus, option C accurately reflects the average alcohol content found in these beverages.