Answer:
I believe the statement that describes the main theme of the poem to be:
A. People in power have divided up the world in ways that are not fair to others.
Explanation:
The speaker in Alberto Rios's poem "The Border: A Double Sonnet" questions how useful and real a border is. The border is invisible to birds and means nothing to the wind. A border is nothing but an imaginary line. Still, those who are in power place such an importance on the border that they give it a type of power it shouldn't have. The border becomes a barrier, a destroyer of hopes and dreams. Those who are in power do not even realize how dangerous and unfair their decisions concerning the border can be. As the speaker says:
The border is a beautiful piece of paper folded carelessly in half.
The way the world is divided through the border is like folding something carelessly. It is imprecise and unfair, not taking justice, dreams, or plans into consideration.