Which activity is not a sustainable human activity? a farming b fishing c mining for minerals

I believe it is C.

Explanation:

Usually Farming and Fishing are natural resources.

c  mining for minerals

Explanation:

Sustainable activity

sustainable development is “development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Examples are as follows:

sustaining the potential of natural and physical resources (excluding minerals) to meet the reasonably foreseeable needs of future generations; and

safeguarding the life-supporting capacity of air, water, soil, and ecosystems; and

avoiding, remedying, or mitigating any adverse effects of activities on the environment

Basically farming & fishing do not compromise the ability of future generations to meet their own needs.  But mining a minerals (which have a limited supply) will compromise future generations.