Which of the following is the correct order of types of electromagnetic radiation from longest wavelength to shortest?

The correct order of types of electromagnetic radiation from longest wavelength to shortest is B, which lists Radiowaves, Microwaves, Infrared, and Visible light in the appropriate sequence.

Radiowaves have the longest wavelengths in the electromagnetic spectrum, which can range from a few millimeters to several kilometers. Following Radiowaves, Microwaves come next with shorter wavelengths, from about one millimeter to one meter, making them suitable for communication technologies like cell phones and radar. Infrared radiation follows Microwaves, characterized by wavelengths that range from about 700 nanometers to one millimeter. Finally, Visible light has even shorter wavelengths, ranging from approximately 400 to 700 nanometers, which are the wavelengths detectable by the human eye.

This progression from radiowaves to visible light correctly depicts the decreasing wavelength of electromagnetic radiation.