Without the provided graphs, it is difficult to give a definite answer. However, if we assume that the stem-and-leaf plot is set up with the smallest value at the top of the stem and the circle graph is properly scaled, then we can determine the answer by comparing the lowest values in each graph.
In the stem-and-leaf plot, the lowest score will be represented by the smallest value on the plot, which will be at the top of the stem. In the circle graph, the lowest score will be represented by the smallest section of the graph.
Therefore, the answer to the question "Which graph shows the lowest score on the test?" would be:
B. only the stem-and-leaf plot, if the plot is set up with the smallest value at the top of the stem and properly labeled.
Note: If the stem-and-leaf plot is set up with the largest value at the top of the stem (which would be unusual), then the answer would be A. both graphs.