Benign Vibrio Cholerae Becomes Pathogenic by All of the Following

Multiple Choice

Benign Vibrio cholerae becomes pathogenic by all of the following steps except

A) a bacteriophage introduces a gene coding for the cholera toxin.
B) the cholera toxin gene is incorporated into the benign Vibrio cholerae chromosome.
C) the benign host is transformed into a disease-causing agent by the toxin.
D) the cholera toxin gene is translated.
E) a bacteriophage binds only to benign Vibrio cholerae without pili.