Each standard size drink always contains:

Explanation:

Choices for this question are:

A. The same amount of calories.

B. The same volume of liquid.

C. The same amount of alcohol.

D. Both B and C.

A standard drink refers to the standard quantity of alcohol in a drink, depending on its type, for example, wines, beers and vodka have different quantity of alcohol, so the standard of each one doesn't mean they have the same amount of alcohol.

So, when we say "the same amount of alcohol", we are refering the same type of drink, which contains always the same amount of alcohol to be considered as standard. For example, 5 fl oz of table wine is the standard drink of wine, which is around 12% alcohol.