The answer is: b. States have intangible boundaries.
A state boundaries is considered to be 'intangible' if they do not possess a physical form that clearly separate one area with the other. Currently, the most states in united states have a physical structure or natural objects (such as forests or mountain) that they use as a sign that separate their territories.
The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet Earth and forming its planetary atmosphere.
someone said my answer was incomplete but its what ever
1= c
2= d
3=e
4=d
5=a
The author is making a cultural allusion, therefore comparing the character to something in our present day culture. I hope this will guide you towards the right answer.