What is the function of hemagglutinin in the influenza virus?

• A. Hemagglutinin is the name of the reverse transcriptase enzyme in the influenza virus.
• B. Hemagglutinin helps release new viruses from infected cells.
• C. Hemagglutinin is part of the protein capsid of the influenza virus.
• D. Hemagglutinin is involved in assembling the membrane envelope that the virus uses as a cloak when it leaves an infected cell.
• E. Hemagglutinin is the protein that helps the influenza virus attach to host cells.