The correct answer is D. Infrared.
Infrared waves are a type of electromagnetic radiation with wavelengths longer than visible light. They are used in remote controls to transmit signals to televisions and other devices. Infrared waves are also used in night vision goggles, heat sensors, and remote-controlled toys.
Ultraviolet waves are a type of electromagnetic radiation with wavelengths shorter than visible light. They are used in tanning beds, black lights, and some medical treatments.
Microwaves are a type of electromagnetic radiation with wavelengths longer than infrared waves but shorter than radio waves. They are used in microwave ovens, radar, and satellite communications.
Radio waves are a type of electromagnetic radiation with the longest wavelengths. They are used in radio, television, and telecommunications.