I think you need to add more.. but I may know where you are leading
Was he 200 m away and made the trip in 200 seconds?
If yes...
2 m/s was his speed and 0 velocity
For the First answer, It would be "A"
The for the next one the answer is "C"
I hope this helps. :)
That's Ampere's Law. ( C ).
The magnetic permeability is the proportionality constant.