The correct option is A When NK is exactly one
In logistic growth model population, equation is described is described as DNdt =rN(1−NK)
where, N = Population density at time t
r = Intrinsic rate of natural increase
K = carrying capacity
when, NK = 1
Now K−NK=0.
So this will be KK − NK
1-1=0
Therefore dN/dt = 0