The integral form of the exponential growth equation is $N_{t} = N_{0} e^{rt}$. Identify $A, B, C$,and $D$ from the given equation where:
$A$: Population density after time $t$
$B$: Population density at time zero
$C$: Intrinsic rate of natural increase
$D$: The base of natural logarithms $(2.71828)$

• A
  $A -r, B -e, C - N_{0}, D -N_{t}$
• B
  $A -N_{t}, B - N_{0}, C -r, D -e$
• C
  $A - N_{0}, B -N_{t}, C -r, D -e$
• D
  $A -N_{0}, B -N_{t}, C -e, D -r$