Final answer:
The belief about communicators handling any situation with complete confidence and skill aligns with Communication Competence Theory, which is not listed in the options but closely related to symbolic interactionism and pragmatist theory.
Step-by-step explanation:
People who accept the belief that a worthwhile communicator should be able to handle any situation with complete confidence and skill are subscribing to the Communication Competence Theory. This theory is not explicitly listed in the provided options, but reflects the general idea that effective communication requires a certain skill set that can be applied confidently across various situations. The options listed, such as Social Identity Theory, Communication Accommodation Theory, Expectancy Violations Theory, and Communication Apprehension Theory, represent other aspects of communication but do not directly address the concept of a communicator handling situations with complete confidence and skill.
Communication Competence Theory is a perspective that is closely aligned with symbolic interactionism, which emphasizes the importance of symbols (like language and gestures) and how individuals create and interpret meanings during interactions. It does relate in broader terms to the pragmatist theory, as the competence of a communicator can be seen as a trait that is useful and has practical applications within a community.