One possible use of transgenic plants is in the production of human proteins,such as vaccines.Which of the following is a possible hindrance that must be overcome?

A)prevention of transmission of plant allergens to the vaccine recipients
B)prevention of vaccine-containing plants being consumed by insects
C)use of plant cells to translate non-plant-derived mRNA
D)inability of the human digestive system to accept plant-derived protein
E)the need to cook all such plants before consuming them