What are the typical height differences between carpet and hard floor?
What is the typical difference in height between levels C and 5?


NONE- the top of the floorboards should be at the same height. Any slight difference between the height of the laminate and carpet is dealt with by using a transition bar.

Your floor coverings are temporary and will be removed and replaced eventually (perhaps when the next owner restores that sweet 80's sunken living room...); you should not build to different subfloor heights to accommodate the temporary floor coverings.