Dr. Tanner randomly selects six students each from three grades at his school. He asks each of the selected students about the number of hours per week they spend on extracurricular activities. He lists the data as shown.



Dr. Tanner wants to use the data to estimate the median number of hours per week that students spend on extracurricular activities.

Which sample medians would be a better estimate of the median for all students at his school, and why?
A.
The median for all students at his school will likely be closer to the estimated medians for grades 6 and 8 because they are close together.
B.
The median for all students at his school will likely be closer to the estimated medians for grades 6 and 8 because they are farther apart.
C.
The median for all students at his school will likely be closer to the estimated medians for grades 7 and 8 because they are farther apart.
D.
The median for all students at his school will likely be closer to the estimated medians for grades 6 and 7 because they are close together.