Label the pre-reproductive stage that represents the largest and the one that represents the smallest portion of its country’s population.

Object A, by 0.5 cubic centimeter      

Explanation:

Density (d) is given by :

m is the mass of an object

V is its volume

For object A:

...........(1)

For object B:

...........(2)

From equation (1) and (2) it is clear that volume of object A is greater by 0.5 cm³. So, the correct option is (b) "Object A, by 0.5 cubic centimeter".