Correct Answer: Slang

Solution : The correct answer is the first option.

Jargon refers to specialised vocabulary or terminology that may not be easily understood by others. Slang is often used for something informal and specific to a particular group.

Here, are the meanings of the other options:

Verboseness: This refers to the use of too many words or excessive verbosity when speaking or writing.

Formality: Formality refers to adherence to established rules or etiquette.

Eloquence: Eloquence refers to the ability to speak or write persuasively, fluently, and effectively.