We can actually deduce here that the author’s primary purpose in this passage is: To express the terror of the situation.
We can also deduce that the phrase that best supports the author’s purpose is: "Those flames...The smell of burning flesh."
We can infer that the memoir genre allow the author to achieve his purpose in this passage in the following way: By conveying the fear and horror they felt.
An author's primary purpose actually refers to the main goal of an author which he/she looks out for to achieve. Such purpose is seen in what the author is trying to convey to the audience.
We can actually see that the above selected answers are correct.
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