Topic or Theme? The Theme of the poem is the relationship between light and darkness.
So you can establish your own credibility as a serious arguer
The main idea is supporting your details right? and the question is asking that needs to support the evidence so it would be close reading or main idea
What is the name of the book? In my guess it will be either A or the last option you gave us
A subordinate clause is the one which cannot exist outside of the main, full, complete clause, it cannot exist on its own.
So, the subordinate clause in this sentence is 'that ran between two commercial buildings near the downtown area'.