Answer:
Infrared radiation
Explanation:
The different ranges of frequency, wavelength and energy of ranges determine their position in the Electromagnetic spectrum.
A is infrared radiation. It has wavelength in the range of 700 nm – 1 mm.
B is visible radiation. It has wavelength in the range of 400 nm–700 nm.
C is Ultraviolet radiation. It has wavelength in the range of 10 nm – 400 nm.
D is X ray radiation. The range wavelength is 0.01 nm – 10 nm.
