Which term refers to the structure that forms the surface of a cell separating its contents from the outside world

A. cytoskeleton

B. Golgi apparatus

C. cell membrane

D. Plasmid

Its definitely cell membrane, because the cell membrane is the outer layer, try looking up a animal cell chart, you'll see a black line around the cell. That black line is a cell membrane, the cell membrane covers over all its contents.

Im pretty sure the answer is C. cell membrane