Which of the following best describes the function of a receiver?

The function of a receiver encompasses a series of critical processes necessary for effective communication and media playback, which is precisely why the chosen response is the best description. A receiver's role includes reception, which is the initial capture of incoming signals; selection, where it filters specific signals from the surrounding noise; detection, meaning that it converts the selected signals into a form that can be understood by the system; and reproduction, which involves translating that processed signal into audio or visual output for consumption. This multi-step function is essential for both audio and video devices, ensuring that the intended message or content is successfully delivered to the user.

In contrast, while the first option focuses solely on video signals, it doesn't encapsulate the full range of functions performed by a receiver. The third option describes a function of a transmitter rather than a receiver, which plays a complementary role in the communication process. The fourth option is too narrow, limiting the receiver's function to only sound waves, whereas many receivers work with both sound and video signals, highlighting their versatility in media processing. Thus, option B effectively and comprehensively describes the broader and more essential functions of a receiver in various communication technologies.