What sentence best expresses the main idea of the passage?

Question

The practice of aquaculture is growing in every part of the world.


Many places in the world are already fished to their limits, and native fish populations are decreasing.


Aquaculture is not experimental, and it is not new.


Many people agree that the growth of aquaculture is important, but others are not sure it is worth it.

Answer 1

The practice of aquaculture is not new and is growing in every part of the world.