Answer:
Answer is "mass" is a measure of quantity of matter in an object.
Step-by-step explanation:
Let us define all the terms to have a better idea about the answer.
a) Volume : it is the measure of space occupied by an object. Volume is product of area and length. So if we keep an object, a solution, a substance etc, we measure volume to know how much space it is occupying. May be with that we can indirectly determine the amount, but not directly.
b) Mass : yes this is the measure of quantity of matter. a similar term "weight" is the measure of gravitational force on an object.
c) Density : it is the measure to know the amount of matter in a unit volume of an object.
d) weight : as defined, it is the measure of gravitational force on an object.