To find out how much juice each container holds, we start by noting that there are 2 gallons of juice poured into 8 containers. To find the amount of juice each container holds, we need to divide the total amount of juice by the number of containers.
We can do the calculation as follows:
\[ \text{Amount of juice per container} = \frac{\text{Total gallons of juice}}{\text{Number of containers}} = \frac{2 \text{ gallons}}{8 \text{ containers}} = \frac{2}{8} \text{ gallons} \]
Now we simplify \( \frac{2}{8} \):
\[ \frac{2}{8} = \frac{1}{4} \]
Thus, each container holds \( \frac{1}{4} \) gallon of juice.
Therefore, the correct response is:
1 fourth gallon.