Purple host could be ambiguous, or not clear, because of the figure of speech and the double meanings. Purple host could be taken literally as a host with a skin pallor of purple. But it could also mean that the host is feeling proud, hence they use the color purple as symbolism. Also, it could mean one way or another. Hence, the answer is letter C.
The answer is entomology (choice B). Root words tell you the simplest word to find the meaning of, affixes are the additions to the root word that have a few typical meanings that allow you to adjust your definition. Etymology is about the origin of words, whether it is related to a place, or a person, or in a foreign language. However, entomology is the study of insects and does not help one understand word meanings.
