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The correct answer is option 3: Chloroplast. Chloroplasts are the structures in cells that contain light-absorbing pigments. The main pigment found in chloroplasts is chlorophyll, which is responsible for capturing sunlight during photosynthesis.
Option 1: Endoplasmic reticulum is a network of membranes involved in protein synthesis and lipid metabolism. It does not contain light-absorbing pigments.
Option 2: Nucleus is the central membrane-bound organelle that contains the genetic material of a cell. It does not contain light-absorbing pigments.
Option 4: Chromoplasts are plastids that contain pigments other than chlorophyll, such as carotenoids. While chromoplasts have pigments, they are not specifically light-absorbing pigments required for photosynthesis.
Therefore, the correct option that contains light-absorbing pigments in cells is the chloroplast.