The answer is pragmatics.
This option refers to the specific guidelines and expectations that govern how people interact verbally within a given cultural context. These rules can include turn-taking, politeness strategies, and appropriate topics of discussion.
This term generally refers to the collective knowledge and cognitive abilities of a society, including how individuals within that society understand and navigate social interactions. It is not specifically focused on the rules of conversation.
Linguistics is the scientific study of language and its structure, including the study of syntax, phonetics, and semantics. While it encompasses the study of conversation, it is broader and not limited to the rules of conversation in a particular culture.
Grammar refers to the set of structural rules governing the composition of clauses, phrases, and words in any given natural language. It is more about the form and structure of language rather than the rules of conversation.
Social norms are the accepted behaviors that individuals are expected to conform to in a society. While they influence conversation, they are broader and encompass all aspects of social behavior.
Pragmatics is the branch of linguistics that studies how context influences the way language is interpreted. It includes the rules of conversation, such as how meaning is constructed in different social contexts, making it the most relevant term for the rules of conversation in a particular culture.