Which of the following will contribute to rebuilding the salmon populations? 

A)  not releasing juveniles from hatcheries 
B)  not releasing extra water from dams 
C)  not allowing salmon to bypass dams 
D)  banning dams from being built in some stream areas

Banning dams from being built in some stream areas will be the most effective choice for rebuilding the salmon populations as dams significantly impact the migration and spawning of salmon. By not building dams in specific areas, the natural flow of water can be maintained, allowing for improved habitats for salmon to spawn and grow. Not releasing juveniles from hatcheries can have negative effects on salmon population growth, as can not releasing extra water from dams. Not allowing salmon to bypass dams can also hinder their ability to migrate and spawn in their natural habitats.