The correct answer will be option-C
Environmental sustainability is the responsible interaction of humans with nature or environment which could allow the environment to be used for long term with good quality.
The interaction includes practices like avoiding depletion and degradation of the natural resources which aims and ensures that the needs of the present population should be fulfilled without jeopardizing the needs of the future generations.
In the given question since putting the paper in the trashcan represents just the organization of the paper in the trash which could not help maintain the sustainability of the environment.
Thus, Option-C is the correct answer.
s responsible interaction with the environment to avoid depletion or degradation of natural resources and allow for long-term environmental quality. The practice of environmental sustainability helps to ensure that the needs of today's population are met without jeopardizing the ability of future generations to meet their needs.