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This is a conditional subordinate clause.
Answer:
The correct answer is Mr. Hyde and Dr. Jekyll are the same person.
Explanation:
In his letter, Lanyon tells about that night where he went to visit Jekyll. Through a letter (which was not typical of him) Jekyll asks dr Lanyon to go to his home and follow specific instructions, which dr does.
There, he narrates everything that happened that night. How Hyde through experiments that went totally in the opposite direction of what Lanyon approved scientifically and morally, he ended up transforming himself into his friend Jekyll.
Lanyon swore, before seeing what was going to happen, that this would be under professional secrecy, that is why he can only tell about it when he dies or when Jekyll disappears. What he saw left him so disturbed that he eventually ends up getting sick and dying.
Given this information we can say that the correct answer is Mr. Hyde and Dr. Jekyll are the same person.
Ethos is used in this sentence. Speakers appeal to ethos to show that they are credible and trustworthy. Appeals to ethos emphasize shared values between the speaker and the audience. Speakers build ethos by explaining their credentials or background to show that they are knowledgeable or qualified to speak on a subject.
In this sentence, ethos is used because credibility is established by referring to the professor at Harvard—who has a PhD— whom the speaker consulted.