Munsell references are primarily used for classifying which of the following materials?

Correct option is A

Munsell: - it is defined as a system that is used to classify colours according to their hue, value (lightness or darkness), and chroma. Munsell colour system is used for identifying colours of any substance or material and creating colours. The Munsell system is most widely used in the paints industry for creating and identifying colours.