Which of the following protein changes is most likely a result of the CF genetic mutation for the form of CF that is described here ? A. A non-polar amino acid is substituted by another non-polar amino acid. B. A positively charged amino acid is substituted by a non-polar amino acid. C. A negatively charged amino acid is substituted by a non-polar amino acid. D. A polar amino acid is substituted by another polar amino acid. These days, treatment of CF symptoms has allowed patients to survive much longer than in prior. Based on the information presented in the intitial passage, which of the following have likely become increasingly more common for CF Patients? A. tung transplant B. inhaled antibiotics C. gene therapy