Answer:
The appropriate alternative is "Option D".
Step-by-step explanation:
- Diffusion would be a random or physical phenomenon that corresponds to that same transfer budget of molecules from some kind of highly concentrated area to something like a lower one.
- The substance which diffuses may be strong, liquids, and gaseous. Correspondingly, the framework where certain diffusion happens can however be amongst the three aspects of sustainability.
All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.