Indigo can best be described as a plant that was used to make blue dye. (Option B)
Indigofera tinctoria, also known as true indigo, refers to a species of plant belonging to the pea family that was one of the original sources of blue dye. It is a deciduous spreading tropical shrub that grows in the southeastern Asia. It generally grows to two to three feet tall and as wide and have pinnate leaves and clusters of red or purple flowers. The shrub was the original source of the blue dye known as indigo. Indigo powder - the famous blue dye - is extracted from the leaves of the indigo plant.
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