You Have Been Asked to Serve Drinks at Your Friend's

You have been asked to serve drinks at your friend's wedding. He asks you to make sure that no one drinks too much liquor, so you try to keep track of how much each guest is drinking. In order to make sure that no one drinks too much, you need to know how much alcohol is in each drink. Which of the following contains the MOST alcohol?

A) four ounces of 80-proof whiskey
B) four ounces of wine
C) a twelve-ounce can of beer
D) four ounces of whiskey or wine, and twelve ounces of beer all contain the same amount of alcohol.