A Certain Gene Is Transformed into a Plant Cell for Potential

A certain gene is transformed into a plant cell for potential use as a vaccine delivery system. Upon performing a Northern blot, a good deal of mRNA for the gene is produced. However, the protein product for the gene is not observed. One explanation may be that the

A) plant cell recognizes and degrades the protein in the cytoplasm.
B) mRNA is not stable in the plant cytoplasm.
C) plant ribosomes are not recognizing the mRNA translational initiation sites.
D) all of the above
E) none of the above