To determine the lowest score among the students who completed their homework from the box plots, you would need to look at the bottom box plot (the one representing "Homework"). The minimum score in a box plot is typically indicated by the leftmost edge of the box or the lower whisker, depending on how the data is distributed.
Since I cannot see the actual box plots, I can't provide the exact answer. However, the choices you've provided (55, 75, 25, 60) suggest that the lowest score will likely be indicated by the lowest point in the box plot for "Homework."
If you have access to the box plot data or can visually check the plot, identify the lowest value (the leftmost edge or the lowest point) of the bottom box plot. That value will be the answer to your question.
If I were to help further, I'd need to know the actual values shown on the box plot.