Answer:
B) the intense colors of the birds.
Step-by-step explanation:
In this passage, the author describes the intense colours of the birds that he encounters. However, in order to convey this message, he compares them to plants and flowers of intense colours. He talks about birds that are brighter than flowers, whiter than lilies, shinier than goldenrod, bluer than calamus, more purple than ironwort, and redder than foxfire.