Problem: How is Bt corn produced?
A) Corn plants are cross-bred with other plants that have high resistance to corn borers.
B) A gene that produces a protein to kill corn borers is extracted from some corn plants and inserted into others.
C) A bacterial gene that produces a protein to kill corn borers is added to the corn genome.
D) Corn DNA is directly modified to create an artificial gene that codes for a protein to kill corn borers.