Viruses have specific glycoproteins found on which structure?

a protein shell
b capsid
c cellular membrane
d nuclear membrane
e none of the above

They are definitely somewhere, so you can drop e.

Viruses are not cells, and neither do they have a nuclear membrane, so d is definitely out....

That leaves a, b and c, and guess what? sometimes a and b refer to the same construct...

Having said that, here's a pic of the CytoMegalo Virus (CMV):

BTW, if you look this page up, notice the mention: "A capsid is the protein shell of a virus"...

CMV is one of those viruses that, upon lysis of the host cell that gave "birth" to them, picks up fragments of the cell membrane. These fragments form the viral envelope, which enables it to infect a new host cell via endocytosis.

It could be this is alluded to in option c, however this is not a viral cellular membrane (they don't exist), but a remnant of the host cell's membrane...

Not all viruses do this, and consequently they only consist of the capsid that encloses the nucleid acid. To invade a host cell, the capsid of these viruses contains proteins that attach to receptors on the host cell's membrane, and they can be glycosylated as well.

Perhaps a bit too technical, but: http://www.pnas.org/content/90/9/3840.full.pdf

So, all a bit fuzzy I know, but essentially a, b and c are potential contenders.

Firstly, because often, in everyday lab-jargon a and b refer to the same thing;

Secondly, in the absence of a viral membrane (fragments picked up from the exploded host-cell) the capsid proteins can be glycosylated.

Thirdly, because an acquired viral envelope originates from the host cell's cell membrane .

It all depends on the type of virus.......

This is as far as I can help you, but good luck and choose wisely....