I believe it's the speech used such as first person, second person, or third person.
Boundaries- a space or limited area of something or someone
Answer:
A. They describe the attributes of Caldwell, Colorado.
Explanation:
Now, first thing to distinguish here is that we need to analyze only this excerpt and its content.
We see that the book itself is about history of Caldwell, however the excerpt doesn't deal with that.
It only shows the town's location, river passing by and rich plant and wildlife.
From that, it can be inferred that Caldwell is a town with beautifull surrounding and natural attributes.
It is sent via the internet
Has an email address
Thats all i can think of