The box plot displays data collected on the shoe sizes for a group of students. A box plot uses a number line from 3.5 to 11 with tick marks every one-half unit. The box extends from 6.5 to 8 on the number line. A line in the box is at 7. The lines outside the box end at 5 and 9. The graph is titled Students' Shoe Sizes, and the line is labeled Size Of Shoe. Which of the following represents the value of the median of the data?
A 6.5
B 7
C 8
D 8.5