Final answer:
Laser hair removal is the technique that utilizes light wavelengths to reduce or eliminate hair bulbs.
Step-by-step explanation:
The hair removal treatment that uses wavelengths of light to penetrate and diminish or destroy hair bulbs is known as c) laser hair removal. This method uses highly concentrated light energy to target the pigments in the hair follicles, which absorbs the light, causing the hair to fall out and potentially delay future hair growth. It's important to note that laser hair removal is most effective on those with dark hair and lighter skin tones.