The correct option is D Indigo
By the thirteenth century Indian indigo was being used by cloth manufacturers in Italy, France and Britain to dye cloth. However, only small amounts of Indian indigo reached the European market and its price was very high. European cloth manufacturers therefore had to depend on another plant called woad to make violet and blue dyes. Being a plant of the temperate zones, woad was more easily available in Europe. It was grown in northern Italy, southern France and in parts of Germany and Britain. Worried by the competition from indigo, woad producers in Europe pressurised their governments to ban the import of indigo.