It means life has its ups and downs. Everything is not always great or not always bad. Somehow it all kind of balances out
Like at the beginning of the book? Where the capulets and Montagues got into a street fight and the prince came and said that if this were to ever happen again they would be sentenced to death.
C. they're because if you fill in they are becuase that is the contraction it makes sense.
The correct answer is D. the world is not a beautiful place. It is not B because they are not confused by evil, rather by struggle and flight, and armies clashing by night.