My best guess:
Option #1. The poem mentions the girl's pure heart, innocent love, and sweet thoughts. This elucidates the impression that (being described as extremely lovely) she is as lovely within as she is without.
Maybe B? I kind of need the passage to tell you for sure :/ or D.
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.