Which of the Following Is a Benefit of Recirculating Aquaculture

Which of the following is a benefit of recirculating aquaculture systems (RAS) in comparison with net or pen aquaculture?

A) Food in RAS systems is controlled by natural processes of the fish life cycle.
B) Fish require less food per pound.
C) Fish convert their food into flesh at a much higher rate.
D) All of these answers are correct.
E) Fish both require less food per pound and convert their food into flesh at a much higher rate.