Which of the plastid(s) contains carotenoids?

To determine which plastids contain carotenoids, let us understand the different types of plastids and their pigment compositions:

1. Leucoplasts: These are colorless plastids primarily involved in the storage of food reserves such as starch (amyloplasts), lipids (elaioplasts), and proteins (aleuroplasts). They lack pigments, including carotenoids.
2. Chloroplasts: These are green-colored plastids responsible for photosynthesis. They contain chlorophyll pigments (chlorophyll a and chlorophyll b) as well as accessory pigments, which include carotenoids (carotenes and xanthophylls) that assist in light absorption and protect chlorophyll from photo-oxidation.
3. Chromoplasts: These are colored plastids (typically yellow, orange, or red) responsible for pigment synthesis and storage in fruits, flowers, and roots. Their distinct coloration is due to the accumulation of high concentrations of lipophilic carotenoid pigments.

Therefore, carotenoid pigments are present in both chloroplasts and chromoplasts.

Thus, the correct option is both (b) and (c).