You must argue that state-sponsored eugenics is either
(a) morally obligatory
or
b) morally prohibited.
That is, you must argue either that
(a) The state is morally obligated to ensure that children yet to be born have better genes than they would naturally end up with if there were no intervention
or
(b) The state is morally prohibited from ensuring that children have better genes than they would naturally end up with if there were no intervention.