The figure shows RNA interference in a tobacco cell. Which statement about the letters is correct? (This topic is not in the NEET syllabus text.)

Fig. 1: The steps of RNA interference with letters. A is the vector that carries a nematode gene into the tobacco cell. B and C are two RNA strands made from the inserted DNA, one the sense strand and one the antisense strand. D is the double stranded molecule that they form. E is the messenger RNA of the nematode, shown cut and crossed out.