It's either A or B. I would go with B though.
Answer:
In these pages what happens is that the children feel frightened because of a "beast". But what is a beast to them turns out to be a person who has died.
Since this person is something they do not know, they are afraid of him.
Explanation:
This question refers to the story Lord of the flies by William Golding.
At this moment a dead man in a parachute lands on the island. It seems to come from the war. Anyway, the boys believe that the man is the "beast" and begins a chase to find and kill him. Only Simon doubts that such a creature exists and believes that the beast is a part of themselves and that they are only afraid of themselves. He goes into the woods to contemplate the situation as Jack and Ralph climb the mountain and find the beast, but they don't stay long enough to see that it is just a dead man.
If the underlined phrase is <em>having been warned by her mother, </em>then this is a nonessential perfect participial phrase.
Nonessential phrases are separated from the rest of the sentence by commas, and since this is a perfect participle, this is the only correct option.
