Which is the wrong statement with regards to Indigo

• A. Indigo was extracted in India from plants of the 'Indigo ferra' group
• B. The chemical structure of Indigo was determined by Baeyer, a German chemist who also synthesized it
• C. Indigo is a dark blue solid soluble in water giving a blue solution
• D. Indigo is fixed to fabrics by the vat process