Answer:
The right answer to this question is: Over Fishing.
Step-by-step explanation:
Catching fish is something that is on human society since the beginning of the ages. But since the industrial revolution, humans are always trying to get ahead of themselves on everything, and that includes over fishing for money.
When humans over fish, they don't give enough time for the fish to recover and reproduce again, and without that time, the population of this fish can decrease a lot. There are a lot of examples nowadays that can be mentioned that confirm this. For example, the whale fishing, this is causing the extinction of them, and that's a problem not only for them, but for the whole ecosystem.