Answer:
B there were 4 ducks living in Anoops pond when he first built it
Explanation:
The equation is in the form
y = a b^x
The a is the initial value at time x =0
The b is the growth rate
x is the time
So
4 * 3^t
4 is the initial amount of ducks
3 is the growth rate, or the duck population increase by a factor of 3 each time period
t is the time period in years