I ink what the other person said
Answer:
C. high construction costs
Explanation:
I believe rottening would be the answer. Rotting, dead plants and animal feaces make great fertilizers.
The human activity that creates the least threat to global stability is : Reuse of Plastic bags.
Plastic bag need a lot of time to be degraded in the soil which will create a threat to the environment. Reusing plastic bag will reduce this threat.
hope this helps