The technique that the author uses to convince the audience that this science fiction novel is high quality is A. word choice to create ethos
This refers to the literary analysis of a book to show the content and to convince people to read or to write criticisms about it.
Hence, we can see that from the given book review, the reviewer notes the content of the book and how it is of high quality, and his word choice such as "colorful characters", "exciting action sequences", etc helps to create ethos.
Read more about book reviews here:
https://brainly.com/question/1103504
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