A. Pastel colors allow the artist to focus more on broad areas of color.
This statement is true because pastels are often used to create soft, broad areas of color due to their chalky texture and vibrant hues, allowing artists to easily blend and layer colors. The other statements are not accurate: pastel colors generally do not darken over time, and pastels are typically dry pigments without binding media, unlike oil paints or tempera which do involve binding agents.