What was illiegal to sell during prohibition?

The Prohibition in the United States was a perdiod of time between the passage of the  Eighteenth and the Twenty-First Amendments, that is between 1920 and 1933 when the selling or transport of alcoholic beverages was prohibited - so the correct answer is "alcohol"

Sorry i don’t know the answer myself

Basically create a schedule on what you need to study and stick with it