Answer:
B. A relation that is a function
Step-by-step explanation:
Let's see what a function is.
A function is a relation each different input has an output.
The given situation is " The enrollment at a high school does not change for 3 years in a row"
This means the consecutive years, the number of enrollment is the same.
Here each different years mapped with only one output. This is relation is a function.
This is classified as "a constant function" because three different inputs has the same output.
Therefore, the answer is B) A relation that is a function.
