Which of the following is an example of non-verbal communication?

Non-verbal communication encompasses any form of communication that does not involve spoken or written words. It includes body language, facial expressions, gestures, posture, and eye contact. Nodding and smiling are quintessential examples of non-verbal communication because they convey messages and emotions without the need for language. Nodding can indicate agreement or understanding, while smiling often communicates friendliness and approachability.

In contrast, asking a question, writing an email, and speaking loudly all involve verbal or written communication methods. These methods rely on words to convey meaning, making them fundamentally different from non-verbal forms. Hence, nodding and smiling stand out as pure representations of non-verbal communication, effectively conveying feelings and reactions without the use of language.