A spot or a stain caused by a discolouring substanceHue(रंग) = the qua
Right Answer is: B
Hue(रंग) = the quality of a color as determined by its dominant wavelength.
Blot(दाग) = make a spot or mark onto.
Tint(रंग) = a quality of a given color that differs slightly from another color.
Dye(रंग) = a usually soluble substance for staining or coloring.
Hence, option B is the correct answer.