WebWork quantitative variable

I have the following question in WebWork:

A description of different houses on the market includes the following three variables. Which of the variables is quantitative?

A. The exterior paint colors.
B. The street number.
C. The school district.
D. The monthly electric bill.
E. None of the above.

I chose B. The street number as a quantitative variable but it was marked incorrect. Why is the street number not a quantitative variable?

If you take the average of the street numbers, it doesn't give an answer that makes sense.

Its not a measured value