To define an appropriate domain for the problem, we need to consider the time frame of Annabel's banana bread baking process. She bakes the banana bread 5 days after returning from the market, which implies that we are interested in the number of days from the time she returned home (which we can denote as \( t = 0 \)) until she bakes the bread (which occurs at \( t = 5 \)).
The function \( f(t) = 8(2)^t \) describes the number of fruit flies as a function of the number of days that have passed. Therefore, the appropriate domain for \( t \) (the time in days) is:
\[ 0 \leq t \leq 5 \]
This indicates that \( t \) starts at 0 (the day she returned home with the bananas) and goes up to 5 (the day she bakes the bread).
So the correct answer is: 0 ≤ t ≤ 5