In a box-and-whisker plot, the maximum value is represented by the rightmost point of the "whisker" or the line that extends from the box to the highest data point. Since I cannot see the plot you are referring to, I can't determine the maximum value directly. However, if the options provided are:
- 53
- 56
- 60
- 68
You would select the highest number listed, which is 68, as the maximum value of the data. Please double-check your box-and-whisker plot to confirm this is indeed the maximum value represented.