the word jargon means special words or phrases that are used in a certian profession that people without that profession would not undertand.
The examples in this recipe are:
Braised, julienned and sprigs.
This tells us that Ponyboy doesn't believe in labels that he see's everybody as people as who they are.<span />
D is the best out of all those options
It helps the reader to understand the text and also helps with remembering events that happen in the story.