Answer:
The variable class standing is categorical.
Step-by-step explanation:
A Variable is said to be categorical is it can take at least two categories or values.
Here (in the question), the students are being categorised based on their levels (freshman, sophomore, junior or senior).
Also, categorical variables are such that they can take on one of a limited, and usually fixed, number of possible values which can be assigned to each individual/groups/categories or other unit of observation to a particular group.