The answer is c. Hope this helps
There are different types of observers. Casual observers differ from scientific observer. Seeing and observing are two different things. Not that everybody seeing is actually observing the thing.
A casual observer just sits back and watch for something to happen while a scientific observer comes up with some hypothesis to work on it.
This is more of a personal question about how well you know yourself, no one can answer this for you.
No, the distance from the last stop..... or c
