You can see more details depending on how "zoomed in" it is or how small the portion is. For example if you look on a map of the world you can see the landforms and bodies of water, but if you look at one of just the US you can see the different state borders as the state capitals, lastly if you look at one of just a single state you can see all the different streets and all the city's located in that state.
Options A and D are true. The other two options are absurd and not even based on fact while A & D are true concerning this part of Africa at that time.
