Which measure is most appropriate to describe the center of the data in the stem-and-leaf plot below?

A stem and leaf plot showing the pounds of food collected is shown. The stems from top to bottom are 0, 1, 2, 3, 4, 5. The first column of leaves is 5, 0, 1, blank, 2, 1. The second column of leaves is 6, 2, 9, blank, blank, blank. The third column of leaves is blank, 3, blank, blank, blank, blank. The fourth column of leaves is blank, 3, blank, blank, blank, blank. The fifth column of leaves is blank, 4, blank, blank, blank, blank.
interquartile range
median
mean
range