Final Answer:
The type of shampoo used to brighten and add a slight hint of color to the hair while eliminating unwanted tones like gold or brassiness is c) Color-enhancing shampoo.
Step-by-step explanation:
Color-enhancing shampoos are specifically formulated to enhance and maintain the vibrancy of colored or highlighted hair. They often contain pigments that deposit a small amount of color onto the hair with each use. In the context of the question, these shampoos are effective in neutralizing unwanted tones, such as gold or brassiness, commonly associated with color-treated blonde or light-colored hair.
While moisturizing, clarifying, and volumizing shampoos serve different purposes, it is the color-enhancing shampoo that addresses the specific need for brightening and tonal correction in colored hair.
Option C, Color-enhancing shampoo, is the answer.