Answer : Option D is correct .
Step-by-step explanation:
Since we have given that
he descended 300 meters in 5 hours i.e.
We should use negative sign with 300 meters as he descended .
And the answer must be in negative .
But in option 'd ' there are two negative signs which make it positive , which can't be its answer as it will denying the statement that ' he descended 300 meters in 5 hours'.
So, option D is not equivalent to Howard's average change in location per hour at all.