Answer:
B. The region outside a nucleus where the electron is moving
Explanation:
The more the electron moves, the higher energy level it has, the slower the electron moves the lowwer energy level it has.
On a topographic map, the contour lines follow a certain elevation across the terrain. So here's what each of the things you mention would mean: If the lines are far apart, that means that there is little or no slope in that area of the map