Which of the Following Statements About the Toxin from B

Which of the following statements about the toxin from B. thuringiensis is false?

A) It was applied as a pesticide long before it was added to plants via recombinant DNA.
B) Many different transgenic crops are grown with the toxin.
C) The use of this toxin has greatly reduced the need to apply pesticides.
D) The toxin acts primarily against vertebrate pests.
E) All of the above are true; none is false.