There is one input being mapped into two different outputs, so this is not a function. The correct option is D.
A function is a relation that maps elements from one set (the domain) into elements from another set (the range). Such that each element from the domain can be mapped into only one element from the range.
In this case, the table is:
So, the input "12" appears twice, the first time is mapped into 300 miles, and the second time is mapped into 350.
So the same value from the domain is being mapped into two different values of the range, meaning that this is not a function. So the correct option is D.
If you want to learn more about functions, you can read:
https://brainly.com/question/13136492