Figuer: -What Did the Researchers Conclude from the Data Shown in Shown

Figuer:
-What did the researchers conclude from the data shown in this figure?

A) The more cholera toxin an organism was exposed to, fewer copies of its CFTR gene that became defective.
B) The number of defective CFTR genes did not correlate with resistance to cholera toxin.
C) The fewer copies of a defective CFTR gene an organism has, the more resistant it is to cholera toxin.
D) The more copies of a defective CFTR gene an organism has, the more resistant it is to cholera toxin.
E) The more cholera toxin an organism was exposed to, the more copies of its CFTR gene that became defective.