Answer: Third option is correct.
Step-by-step explanation:
Certain high-frequency radiations are likely to cause harm to astronauts landing on Mars.
Ultraviolet is the most suitable to study this harmful radiation on Mars.
It has highest frequency than X-rays but shorter than visible rays.
It is harmful is nature as it causes painful sunburns and premature ageing of the skin etc.
Hence, Third option is correct.
