The correct answer is D.
In this excerpt from "Sir Gawain and the Green Knight," we can see that everyone was scared of the skin colour of the Knight. So much that they though he might have been a ghost.
So, when the green Knight spoke, nobody could answer him, not even the noble Knights, who were petrified.
C) The deacidification process preserves pages by neutralizing acid with magnesium oxide, raising the pH level of the paper, and minimizing the alkaline reserve.
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I believe the answer to this is A
The first answer has almost nothing to do with the original passage, the next 2 are just copies of the passage, the last answer deals with the passage yet also adds additional information making it the best paraphrase.