Which of the following is an example of an output device?

The correct answer is the monitor because it is designed to display visual output from a computer or other device. A monitor allows users to see the graphical user interface, text, images, and videos, effectively serving as a primary means of presenting information processed by the computer.

In contrast, the other devices listed serve different functions. A scanner is an input device that captures images or documents and converts them into a digital format for processing. A webcam also functions as an input device, allowing users to send video data for communication or recording. Similarly, a microphone captures audio input, enabling sound recording or voice communication. These devices bring information into the system rather than presenting it, confirming the monitor as the quintessential output device in the scenario provided.