Aquaculture is one of the world's fastest growing food industries．It is replacing commercial fishing in many places and is reducing the price of salmon to about a third of its earlier price．The other benefit of aquaculture is that it allows the wild salmon population to recover．About a quarter of a million more salmon returned to their home rivers to produce eggs each year in the mid-1990 s．

Question：What can we conclude from the last paragraph?

1. A.
   Aquaculture has reduced the price of salmon to about a third of its earlier price．
2. B.
   Aquaculture is replacing commercial fishing in many places．
3. C.
   Aquaculture benefits the wild salmon population to recover．
4. D.
   Aquaculture benefits the ecosystem of the salmon and promotes the development of the food industry．