In the prologue, it states: From forth the fatal loins of these two foes A pair of star-crossed lovers take their life Whose misadventure piteous overthrows Doth with their death bury their parent's strife. What does the prologue reveal is the result of the final calamities in the play?

A The Capulets and Montagues end their feud after their children's deaths.

B The town of Verona is utterly devastated and destroyed by the feuding families.

C Romeo and Juliet live happily ever after.

A The Capulets and Montagues end their feud after their children's deaths.

Explanation:

From the prologue, it is said that the children of two warring families take their life "From forth the fatal loins of these two foes a pair of star crossed lovers take their life".

It also further states that because of the grief of the deaths, the two warring families end their feud," ... doth with their death bury their parent's strife"

From the prologue, it is revealed what the result of the final calamities in the play will turn out to be which is that The Capulets and Montagues end their feud after their children's deaths.