Hey,
Despite being in the wrong subject, this would belong in Science, it is a very good question. To solve this question start by defining each of your choices:
The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg.
The size is defined as "the relative extent of something; a thing's overall dimensions or magnitude; how big something is."
Density is defined as "mass per unit volume". The formula for density is p=m/V, density (p) is equal to mass (m) divided by volume (V).
Area is "the quantity that expresses the extent of a two-dimensional figure or shape, or planar lamina, in the plane." The formula depends on what shape you are using.
Using these definitions, we can conclude that the correct answer is density.
Mass divided by volume is equal to density.
Cheers,
Izzy
