Answer :
The meaning of the word "inauspicious" in the given context is unfavorable, boding. So the correct option is D.
When anything is believed to be unfavorable or a poor omen, it is referred to as "inauspicious" or "unfavorable." It implies that nothing related to or connected to the "inauspicious portal" is likely to result in lucky or favorable outcomes.
In the passage from "The Scarlet Letter," the author writes that the story is going to emerge from this unlucky portal, meaning that the things or things connected to this portal might not be promising or might have negative overtones.
The word "inauspicious" creates a sense of dread that as the narrative moves forward, something potentially unpleasant or ominous may happen. So the correct option is D.
To learn more about the Scarlet Letter link is here
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The answer is D:
Inauspicious means something that does not have a high chance of success, or is unfavorable.