Read the excerpt from The Hot Zone.
Gene Johnson, the Ajax of this biological war, paced back and forth across the loading dock among a pile of camouflaged military trunks—his stockpile of gear from Kitum Cave. The trunks contained field space suits, battery packs, rubber gloves, surgical scrub suits, syringes, needles, drugs, dissection tools, flashlights, one or two human surgery packs, blunt scissors, sample bags, plastic bottles, pickling preservatives, biohazard bags marked with red flowers, and hand-pumped garden sprayers for spraying bleach on space suits and objects that needed to be decontaminated.
The main purpose of the jargon in this excerpt is to
A. describe the setting in vivid and accurate detail
B. convince the reader that the text is nonfiction
C. make the text seem more genuine and authentic
D. prove that the writer is an expert on the subject

Explanation: the term "jargon" means special words or expressions used by a profession or group that are difficult for others to understand. In the given excerpt from "The Hot Zone" we can see an example of the use of jargon, in this case, related to military gear in a biological war. The purpose of using jargon in the excerpt (for example: syringes, pickling preservatives, biohazard bags, etc) is to make the text seem more genuine and authentic.