Final answer:
The color that fades and lasts 4-15 shampoos is Semi-permanent. It washes out after four to six weeks and does not chemically alter hair structure, unlike permanent hair color.
Step-by-step explanation:
The color that typically remains until it fades and lasts around 4-15 shampoos is C. Semi-permanent. Semi-permanent hair color washes out over time, which is usually between four to six weeks, making root regrowth less noticeable. Unlike permanent hair color, which chemically alters the hair's structure, semi-permanent dye deposits color onto the surface of the hair without lightening it, as the semi-permanent color cannot lighten hair like bleaching. This allows for natural variations in hair shade across the head and a less harsh color transition than that achieved with permanent dye.
Therefore, the correct answer to the question 'Which color remains until it fades and lasts 4-15 shampoos?' is C. Semi-permanent.