What best defines feedback in a communication context?

Feedback in a communication context is best defined as a method for verifying a message. It involves the responses and reactions from the receiver back to the sender, which can confirm whether the message was understood as intended. This process is essential for effective communication, as it allows both parties to engage in a dialogue, clarify misunderstandings, and ensure that the intended meaning is conveyed accurately.

While the other options touch on various aspects of communication, they do not encapsulate the core function of feedback. For instance, expressing opinions is part of a broader communication process but does not specifically address the verification of messages. Similarly, using feedback as a tool for promotion or a strategy for persuasion may occur in certain contexts, but they do not capture the essential function of feedback in establishing clarity and understanding in communication. Therefore, defining feedback primarily as a method for verifying a message is crucial for effective interactions in both personal and professional settings.