What is the wavelength range of radio waves?

The wavelength range of radio waves encompasses a broad spectrum of electromagnetic radiation, extending from very low frequencies to relatively high frequencies. Radio waves typically have wavelengths ranging from about 1 millimeter to 100 kilometers, which corresponds to frequencies from 300 GHz (gigahertz) down to 3 kHz (kilohertz). This includes the frequencies outlined in options A, B, and C.

The correct choice reflects that the category of radio waves is not limited to a single specific range but rather spans a continuum where all mentioned ranges can include various types of radio waves. The expansive nature of radio waves allows for a wide array of applications, including communication signals, broadcasting, and observing celestial phenomena. Thus, "All of the above" correctly acknowledges that different definitions of the radio wave spectrum can overlap and that the ranges specified in the other choices are indeed valid representations of radio waves within varying contexts of use and technology.