The component of language concerned with how to engage in effective and appropriate communication with others is :

Correct option is C

The component of language concerned with how to engage in effective and appropriate communication with others is 'pragmatics'. Pragmatics involves understanding the social rules of language and communication, which includes using language in various social contexts, recognizing the appropriate use of language in different settings, understanding implied meanings, and using language for different purposes (such as persuading, requesting, informing). Pragmatics is a key aspect of communicative competence.