The absorptive relationship between energy and mass can be expressed as:

The absorptive relationship between energy and mass is most accurately represented by the equation that describes how energy relates to the amount of mass. In classical physics and especially in the context of relativity, energy (E) is often expressed in relation to mass (m) through the equation E = mc^2, which shows that energy is proportional to mass.

In the context of the answer selected, energy divided by mass provides a measure of the energy per unit mass, which aligns with concepts such as specific energy. Specific energy is a useful concept in various applications, as it allows us to relate the amount of energy contained in a mass to that mass, making it a practical and informative relationship in physics.

This relationship is particularly significant in understanding processes involving energy transfer or transformations, such as in chemical reactions, nuclear reactions, and thermodynamic systems, where the concepts of energy per unit mass (specific energy) and the conservation of mass-energy are crucial.