The audience learn about the Capulets and the Montagues from the prologue is they are powerful families in Verona that have been at war for many years.
Capulets and Montagues were the two families living in a neighbor in the play of Shakespeare, Romeo and Juliet.
There were feuds between these families for years, which leads to the tragedy in the story of Romeo and Juliet.
Thus, the correct option is B. They are powerful families in Verona that have been at war for many years.
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