Participles are words formed from verbs that can be used as adjectives. In this sentence, "roaring" would be B, participle.
The answer would have to be D, unchallenging due to its context. The author is describing a final word that is described as something that is obvious (the reader can’t ignore it).
Therefore, within that context, the adjective would have to be something that “grabs” the readers’ attention. That would obviously rule out commonplace, which, by name alone doesn’t catch you as something unable to ignore. Oddly that answers B and C are the same, but can also be ruled out quickly within context. “Comfort” also suggests that it is almost redundant, but certainly not something to keep an audiences’ attention.
The only answer, therefore, that answer that makes sense within context, as well as providing an eye-keeping ending for a conclusion paragraph would be unchallenging.
Answer:
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The universe was created by God
in the beginning - God started creation
the first day - light was created
the second day - the sky was created
the third day - dry land, seas, plants and trees were created
the fourth day - the Sun, Moon and stars were created
the fifth day - creatures that live in the sea and creatures that fly were created
the sixth day - animals that live on the land and finally humans, made in the image of God were created
by day seven - God finished his work of creation and rested, making the seventh day a special holy day.