Which word is most related to "jargon"?

Which word is most related to "jargon"?

A) Categorize

B) Response

C) Slang

D) Attendant

Epistolary

[ih-pis-tl-er-ee]

adjective

1. relating to or contained in letters or the writing of letters

Examples of epistolary in a sentence:

• The novel's epistolary format, composed entirely of letters, gave it a personal and intimate tone.

• Their epistolary friendship spanned decades, with hundreds of letters exchanged over the years.