It would be D ------------
Indigo was mainly used for blue dye (D).
It was very important because it is rather rare. During the colonial times indigo was considered the second important cash crop. This was because many royals would buy it and it became a symbol of high class
Hope this helped!
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Truman then offered a compromise that Russia could take reparations from zones that were occupied which were to allow them to recover in zones they weren't in control of.