The correct option is D All of the above
Plastids are small bodies found free in the cytoplasm of most plant cells. Plastids develop from colourless precursors called proplastids. Leucoplasts are colourless plastids of various shapes that generally occur in non green plant cells near the nucleus. Leucoplasts may get specialized into - amyloplasts (for storing starch), aleuroplasts (for storing proteins) and elaioplasts (for storing fats). As development of pigment requires light, when proplastids mature in darkness there is no pigment formation and colourless leucoplasts develop.