Several of the protein from influenza virus interact with the cellular protein a-importin.Why is this necessary for virus infection?

A) It allows the viral proteins to by glycosylated in the Golgi.
B) It is important for entry of the viral genomes into the cell.
C) It transports the viral proteins to the plasma membrane.
D) It transports the viral proteins into the nucleus.
E) It is involved in fusion of the viral envelope with the endosome.