To find the total worth of all the candy bars, we first need to determine how many candy bars there are.
Each box holds 3 candy bars, and there are 3 boxes, so the total number of candy bars is:
\[ 3 \text{ bars/box} \times 3 \text{ boxes} = 9 \text{ bars} \]
Next, we calculate the total value of the candy bars. Since each bar sells for $3, we can find the total worth by multiplying the number of bars by the price per bar:
\[ 9 \text{ bars} \times 3 \text{ dollars/bar} = 27 \text{ dollars} \]
Thus, the total worth of all the candy bars is $27.
The correct response is: $27.