Munsell colour chart contains about . . . . . . . . different coloured papers or chips

Answer: Option A

Munsell colour system is a colour space that specifies colours based on three properties of colour: hue (basic colour), chroma (colour intensity), and value (lightness). It was created by Professor Albert H. Munsell in the 20^th century and adopted by the United States Department of Agriculture as the official colour system for soil research in the 1930s.
Munsell's colour chart contains about 175 different coloured papers or chips.