This is an onomatopoeia. This is because of the words “growled” and “grumbled”.
Answer:
The answer is the last option, "It helps readers understand how far away black holes are located." Hope this helped.
Explanation:
Including Keffer's memory helps achieve the author's purpose because the author's purpose is to inform, and this informs the reader about pedestrians, and what they should do! It's important to know what Keffer remembered because it helps achieve the authors' purpose, and adds on to more information mentioned earlier in the text. It also gives us Keffer's point of view!
