The Fact That the Outer Membrane of the Nuclear Envelope

The fact that the outer membrane of the nuclear envelope has bound ribosomes allows one to most reliably conclude that

A) at least some of the proteins that function in the nuclear envelope are made by the ribosomes on the nuclear envelope.
B) the nuclear envelope is not part of the endomembrane system.
C) the nuclear envelope is physically continuous with the endoplasmic reticulum.
D) small vesicles from the Golgi fuse with the nuclear envelope.
E) nuclear pore complexes contain proteins.