Which line from the prologue of romeo and juliet reveals the ending of the play? from ancient grudge break to new mutiny, where civil blood makes civil hands unclean. from forth the fatal loins of these two foesa pair of star-cross’d lovers take their life

The option that foreshadows the ending of the play would be the one that says, “a pair of star-cross’d lovers take their life.”

Throughout the play, the conflicts between the Montagues and the Capulets are highlighted through brawls, verbal insults, and family gossip, however, when Romeo kills Tibalt in the beginning of the play (where civil blood makes civil hands unclean) it acts as a catalyst for the rest of the events in the play. So that option foreshadows an event in the beginning, rather than the ending of the play. Similarly, the other options refer to the building of Romeo and Juliet’s relationship against their families wishes (from ancient grudge break to new mutiny) which is also in the rising action of the play. So the only answer that refers to the ending is the foreshadowing of the double suicides by Romeo and Juliet.

I hope this helps :)