Choose the incorrect statement with respect to development of pest resistant tobacco plant. 

• A

  RNAi is seen in all eukaryotes as a method of cellular defence. 

• B

  RNAi prevents the translation of mRNA of the parasite in the plant by forming double stranded RNA.  

• C

  The source of complementary RNA is infection of plant by a DNA virus. 

• D

  The source of complementary RNA can be mobile genetic elements.