Answer
... $A$ ...
and
... $c$ ...
(in that order)
Work Step by Step
The logistic growth model, given by $A=\displaystyle \frac{c}{1+ae^{-bt}}$,
(a,b,c are constants and $c>0, b>0$)
describes situations in which growth is limited.
$y=c\ \ $ is a horizontal asymptote for the graph,
and growth, $A$, can never exceed $c$.
-----------------
So, the blanks should be filled in with
... $A$ ...
and
... $c$ ...
(in that order)
