A small concentration of eumelanin will produce what hair color?

A small concentration of eumelanin primarily leads to lighter hair colors, such as light blond. Eumelanin is a type of pigment responsible for dark hair shades, with its higher concentrations resulting in darker colors like brown or black. In the case of light blond hair, the low level of eumelanin allows for a much lighter appearance, often complemented by other pigments, such as pheomelanin, which can give hair a warmer tone. This mixture of low eumelanin and potentially higher pheomelanin contributes to the light blond shade, making it the accurate answer in this context.