Answer:
Option D is the categorical variable.
Step-by-step explanation:
Categorical variables are those that are not numerical. Like the data set containing peoples eyes color.
A) the number of persons watching the show - Not categorical.
B) the ages of all persons watching the show - Not categorical.
C) the number of times the show has been watched in the last month - Not categorical.
D) the name of the show (if any) being watched - Categorical.