Option 1: Chloroplasts are responsible for photosynthesis, where they convert sunlight into energy and produce glucose. They contain chlorophyll, which gives them their green color. However, chloroplasts primarily store starch as a form of energy, rather than granules of oil or protein. Therefore, option 1 is not the correct answer.

Option 2: Leucoplasts are the correct answer. These plastids are colorless and are responsible for storing starch, oil, and protein granules. They can be found in non-photosynthetic plant tissues such as roots and tubers. Leucoplasts come in different forms, including amyloplasts for starch storage, elaioplasts for oil storage, and proteinoplasts for protein storage. Therefore, option 2 is the correct answer.

Option 3: Chromoplasts are responsible for storing pigments other than chlorophyll. They are found in fruits, flowers, and roots, giving them their distinct colors. However, chromoplasts do not store starch, oil, or protein granules. Therefore, option 3 is not the correct answer.

Option 4: Xanthoplasts are not a recognized type of plastid. Therefore, option 4 is not the correct