Answer: B. Hardness
Explanation:
Qualitative properties are properties that are observed and can generally not be measured using a numerical value. Example : Cleavage, Luster , streak
Quantitative properties are properties that are observed and can generally be measured using a numerical value. Example: hardness
Hardness of minerals is the resistance of a material to deformation. It is measured using Moh's scale which ranges from 1 to 10 and thus have a numerical value.
Thus Hardness is a quantitative property of minerals.
