The correct answer is D. Ultra-violet radiation.
X-rays are a type of electromagnetic radiation with a wavelength shorter than that of visible light. They are used in medicine for imaging and in industry for welding and other applications. X-rays can damage DNA, which can lead to cancer.
Infrared rays are a type of electromagnetic radiation with a wavelength longer than that of visible light. They are used in heating, cooking, and remote sensing. Infrared rays can cause heat damage to skin and eyes.
Microwave radiation is a type of electromagnetic radiation with a wavelength longer than that of infrared light. It is used in cooking, radar, and telecommunications. Microwave radiation can cause heating of tissues.
Ultraviolet radiation is a type of electromagnetic radiation with a wavelength shorter than that of visible light. It is used in tanning beds, germicidal lamps, and lasers. Ultraviolet radiation can cause sunburn, skin cancer, and eye damage.
Of the options given, only ultraviolet radiation has the energy to damage DNA and kill bacteria.