Authors view point, essay topic, major reasons,
<span>When I first beheld this apparition—for I could scarcely regard it as less—my wonder and my terror were extreme.”</span>
The correct option is B.
An appositive phrase refers to a noun or a pronoun that identifies or rename another noun or pronoun; it gives more information about that noun or pronoun. An appositive together with its modifier is called an appositive phrase. An appositive phrase is said to be non- essential when it adds information to a sentence whose meaning is already clear. Non-essential appositives are usually set off by a coma.
I think it’s C
I would wait for more people to answer and pick from there.