Looking at the distributions, we can say that:
1) The distribution of class sizes at Northview HS is symmetric and centered at 21
2) The distribution of class sizes at Southdale HS is skewed at the right, with the mode at 25
From these two statements and the fact that the distribution 1) is a normal distribution, we can say that the median is at 21. On the other hand, for 2) the skew is beyond 21, because the mode is at 25, so the median should be greater than 21.
Answer: Option B