Question

variations in hair color reflect differences in the pigment produced by
soft keratin.
melanocytes.
dermal papillae.
carotene cells.
keratinocytes.

Explanation:

Melanocytes are cells that produce melanin, the pigment responsible for hair color variations. Soft keratin is related to hair texture, dermal papillae are involved in hair - follicle nourishment, carotene cells are more related to skin color from carotene pigment, and keratinocytes produce keratin not hair - color pigment.

Answer:

B. melanocytes