Answer:
E.
Step-by-step explanation:
The variable that represents this would be both Quantitative and Discrete. This is because since this variable is measuring the amount of days it has a value type which therefore makes it a Quantative variable. Also, since the number of days that mankind has waled the Earth is a finite value, regardless of how large it may be, it would be considered to be a discrete variable. Continuous variables would be something along the lines of "What is the size of the Universe?" because the value of this variable would be neverending since we cannot calculate it.