Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
Umbilicus or umbilical cord and im not sure about the name of the process!
It's a ! cnidocytes help in defence and also in capturing prey ! so answer is A !!