This natural hair color is generally the thickest (has the highest density). Which color is it?

• A. Black hair
• B. Red hair
• C. Blonde hair
• D. Brown hair

Answer: (C)

The concept being tested is hair density—the number of hair strands per unit area on the scalp—rather than the thickness of an individual strand. In many cosmetology references, natural blond hair is described as having the greatest density, meaning more hairs per square centimeter, which gives a fuller appearance overall. This generalization is used in study materials to help recall how color can relate to perceived fullness. Remember that actual density varies widely by person and isn’t determined strictly by color; density and shaft thickness are separate traits. Among the given colors, blond hair is the one most commonly associated with higher density in these materials, so it’s labeled as the best answer.