The Best Single Property by Which Most Minerals Can Be

The best single property by which most minerals can be identified is:

A) color, which depends on how much light a mineral's specific chemical makeup and crystal structure cause it to absorb or reflect.
B) hardness, its resistance to scratching or abrasion.
C) streak, the color of the powdered mineral without trace impurities.
D) none of the above, because minerals can seldom be identified on the basis of only one property.