Answer:. A girl finds out that her best friend is her sister. The audience has known all along.\
The definition of tranquility that is most likely suited for this line is calmness: peacefulness.
That is what the word tranquil means.
<span>The Religious shift that took place when Oedipus was king was a gradual one. It started with the poor people them move up to the rich. The king himself was the last one to give up his god.</span>