Concept:The pronoun “they” in “So they are” must be traced to the exact thing the previous speaker has just been describing.
Explanation:Just before this speech, Prospero tells Ferdinand that his nerves are in a weak and powerless state.
Ferdinand answers, “So they are.”
He then goes on to say that his spirits are bound up as in a dream, and that even his father’s loss and the threats of the man who has subdued him feel light.
This shows that he is agreeing about the condition of his nerves, not about his friends or the monster’s threats.
The listener’s spirits are not the subject of the remark.
Therefore, the pronoun “they” directly refers to the speaker’s nerves.
Answer:B. speaker’s nerves