Final answer:
Darker shades of a solution (higher concentrations) absorb light (d).
Step-by-step explanation:
Darker shades of a solution (higher concentrations) absorb light (d). When a solution is more concentrated, it contains a higher number of particles, which increases the chances of light being absorbed rather than transmitted or reflected. For example, if we compare a dilute solution of blue dye to a concentrated solution of the same dye, the concentrated solution will appear darker because it absorbs more blue light.