Which of the following best represents non-verbal communication?

Non-verbal communication is primarily conveyed through body language, facial expressions, gestures, eye contact, posture, and other forms of physical expression, which do not involve spoken or written language. Therefore, the option highlighting gestures and facial expressions is the most accurate representation of non-verbal communication.

Gestures, such as waving hello or shaking hands, and facial expressions, like smiles or frowns, effectively convey emotions and reactions without the use of words. These elements are crucial in enhancing or complementing verbal communication, and they can communicate a wide range of feelings and intentions, often more powerfully than language alone can.

In contrast, the other options involve verbal or written forms of communication, which do not fall under the category of non-verbal communication. Typed emails and letters rely on written words to convey messages, while formal speeches primarily involve spoken language directed at an audience. Written contracts are also a form of written communication used to outline agreements and responsibilities. Hence, they do not represent non-verbal communication.