B. Not moving, is the correct answer.
A is not correct because constant speed on a distance vs. time graph would vertically point to the right. C is not correct because acceleration on a distance vs. time graph would curve upwards. D is not correct because B applies to the graph.
Hope this helps :)
This is your answer.... all you are doing is substituting what ever the variable is
For this case we must find the value of the following expression:

When:

Substituting the given values we have:

Finally, the value of the expression is 394.
Answer:
The value of the expression is 394.
12/16=3/4, 3/4*8=6. Therefore Caitlin still has 6 km to go, So d=6