Final answer:
The median is the best measure of center for this data set because it is less affected by extreme values.
Step-by-step explanation:
The best measure of center for this data set would be the median because it is less affected by extreme values. The mean, also known as the average, can be influenced by outliers, which can distort the overall picture of the data.
In this case, the heights of the five sunflowers have some variability, so the median would provide a more accurate representation of the typical height.