Transitions help you to keep moving forward in the story and moving from one thing to the next without confusion.
The correct answer is C. <span>She lives on the twentieth floor of an old apartment building somewhere in Manhattan.
First of all, in front of 'twentieth floor,' there has to be the article THE, because there is only one 20th floor in a building. Additionally, in front of 'old apartment building,' there has to be the article AN, because we don't know which building exactly + the word starts with a vowel, so it has to be AN rather than A.
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A reasonable inference that one can make out of this poem is that you should not be worried about your fate, because at the end people are part of a generation which has its own struggles and at the end, people have to face their own destiny,being courageous, as the previous generations were and have been.
This is the reason why is possible to conclude that the two lines best linked to the theme are:
"Be comforted; the world is very old,
And generations pass, as they have passed"
Why do most people choose to vacation in the mountains? Simply because the climate is perfect, and the sights are soothing