It becomes necessary for one people to dissolve the political bands which have connected them with another.
First of navigavisti is past tense, so you can immediately rule out options B and C. Then, the phrase <em>de quo </em>can be translated as <em>of who, </em>or <em>of what, </em>or <em>from where. </em>Thus, the correct answer is From where did you sail?
De quo means from where, and not why, so A is also incorrect.
I think it is a foreshadowing
