Which of the following are continuous random variables?​ I. The weight of an elephant
II) The time to answer a questionnaire
III) The number of floors in a skyscraper
IV) The square feet of countertop in a kitchen

A) ​I and II only
B) ​III and IV only
C) ​I, II and IV only​
D) ​I, II, II, and IV

I) The weight of an elephant can take any value on a continuous scale, making it a continuous random variable.
II) The time to answer a questionnaire can also take any value on a continuous scale, making it a continuous random variable.
III) The number of floors in a skyscraper is a discrete variable as it can only take integer values.
IV) The square feet of countertop in a kitchen can take any value on a continuous scale, making it a continuous random variable.