Upside Down Electrical Outlet
In this bedroom, one of the electrical outlets is upside
down. There is a very good chance, that someone replaced this electrical
outlet or turned it upside down for some reason. During the home's final
building inspection, all the electrical outlets should be facing up,
like outlet B.
This does not affect the house electrical system in any way and could be
more of a cosmetic issue than anything else. However, I would imagine
someone with poor eyesight or if someone was trying to plug an extension
cord into this outlet and it was behind something or you had limited
vision of the outlet, could have difficulties plugging the cord in.
In other words, you thought that the plug was installed right side up
and are now having problems trying to plug your extension cord into the
outlet. 
This electrical outlet can be turned over and reinstalled, most of the
time with very little difficulty. I would recommend having someone with
electrical experience perform this task. If the sides of the electrical
plug were touched in any way, by your hand or finger, you could feel a
sudden jolt of electricity or get shocked.
Any electrical problems like this should be repaired by a licensed
electrical contractor or someone with electrical experience. It's
dangerous to repair any part of your home, where you lack the
experience.