I believe he is drawing a parallel between a tone of pure joy and the most depressing despair.
The author's purpose can be discovered by:
- Details in the story
- Historical context
<h3>What is an author's purpose?</h3>
The author's purpose is the intention of the author behind his writings. It is the reason or the intent in writing. It may be to persuade, inspire, amuse, or inform the reader.
The author's purpose may be determined by the details presented in the story and the historical contexts of the story and the author.
Therefore the correct options are I and II.
Learn more about the author's purpose here:
brainly.com/question/4687474
