Is there perhaps an image of the passage or you can type it out in order for us to help you? :3
Answer:
Which of the following is NOT part of the plot structure? The cast of characters are NOT part of the plot structure. The plot structure consists of an exposition, a rising action, a climax, falling action, and the resolution. Characters are important to the plot, but not a part of the actual structure of it.
I think the correct answer from the choices listed above is option D. The figure of speech being used here is a simile. The use of the word "as" shows that a simile is being used to compare the quality of the fleece to snow. Hope this answers the question. Have a nice day.