Step-by-step explanation
If one tail of the distribution is longer than the other, showing any kind of symmetry, it is said to be skewed, otherwise, if a distribution is said to be symmetric if one half of the distribution is a mirror image of the other half.
Answer
In this case, the distribution representing the class sizes at Northview HS is symmetric and the distribution representing the sizes at Southdale HS is skewed negativily, it is a negative skewness because it has a long left tail (long tail in the negative direction on the number line)
Summary
Option A is the correct answer, Northview HS is symmetric and Southdale HS is negatively skewed.