Which UV ray types are listed in the material?

Which UV ray types are listed in the material?

• A. UVA and UVB only
• B. UVA, UVB, and UVC
• C. Only UVB
• D. UVC and UVA

Answer: (B)

UV rays are categorized by wavelength into UVA, UVB, and UVC. The material you’re studying lists all three types, so the correct choice includes UVA, UVB, and UVC. UVA has the longest wavelengths and contributes to aging and tanning; UVB has shorter wavelengths and mainly causes sunburn and direct DNA effects; UVC is the shortest and is largely blocked by the atmosphere, though it is still a form of UV radiation and can appear in some educational contexts for completeness. The option that mentions only UVA and UVB misses UVC, the one with only UVB leaves out UVA and UVC, and the one with UVC and UVA but not UVB omits UVB.

UV rays are categorized by wavelength into UVA, UVB, and UVC. The material you’re studying lists all three types, so the correct choice includes UVA, UVB, and UVC. UVA has the longest wavelengths and contributes to aging and tanning; UVB has shorter wavelengths and mainly causes sunburn and direct DNA effects; UVC is the shortest and is largely blocked by the atmosphere, though it is still a form of UV radiation and can appear in some educational contexts for completeness. The option that mentions only UVA and UVB misses UVC, the one with only UVB leaves out UVA and UVC, and the one with UVC and UVA but not UVB omits UVB.