A person has a very advanced sense of what is socially appropriate and always knows what to say in every social context. The person has which kind of linguistic competence?

Knowing what is socially appropriate to say in every context is pragmatic competence.

Pragmatics is language in use, matching words to social situation, purpose and listener.

Phonemic competence concerns the sound system of a language, not social fit.

Cognitive competence is about thinking and processing, not situational appropriateness.

Syntactic competence is command of grammar and sentence structure, a separate ability.

Pragmatic skill is what makes speech socially effective, not just correct.