Answer:
D) all of the above
Explanation:
All the variables which can be represented using numerical values are called quantitative variables. In the given instance, we have variables related to different houses, as following:
- square footage of the house - this will always be represented in numerical terms and thus it is a quantitative variable.
- the monthly gas bill - this will always be represented using currency, as will be represented in 'n' number of currency, and therefore quantitative variable.
- the monthly electric bill - as same as above this will be represented in 'n' number of dollars and therefore, it is also quantitative variable.
Therefore, all of the above are correct options.