Answer:
C. ultraviolet light
Step-by-step explanation:
Ionizing radiation begins in the electromagnetic spectrum at the frequency of ultraviolet (UV) light. UV light has a higher frequency than visible light but lower frequency than X-rays and gamma rays, which are also considered ionizing radiation. When UV light interacts with matter, it can ionize atoms and molecules, leading to potentially harmful effects on living organisms. Therefore, it is important to take precautions and limit exposure to ionizing radiation.