Final answer:
The indicator that proves sustainable processes in a region with an increasing population is c) Growth in renewable energy usage, as it represents a shift towards sustainable resource use without harming the environment.
Step-by-step explanation:
To determine which indicator proves that a region with an increasing population is using sustainable processes, we must look for activities that contribute to long-term environmental health and resource availability.
This option indicates a shift away from dependency on fossil fuels, which result in reduced biodiversity due to overuse and pollution, and leads to exploiting renewable energy sources that do not deplete natural resources or cause significant environmental harm.
On the contrary, increased deforestation rates, decline in air and water quality, and rising levels of pollution are all signs of unsustainable resource use and ecosystem degradation. Thus, a commitment to renewable energy reflects a consideration for sustainable practices in a growing human population.
The correct answer in this case is c) Growth in renewable energy usage.