Cystic fibrosis is a genetic disease that leads to the production of excessive,

Cystic fibrosis is a genetic disease that leads to the production of excessive, thick mucus in the respiratory tract, causing frequent and serious respiratory infections. The defect is due to the production of a faulty membrane protein for the transport of the chloride ion. The protein exists in membranes, but it doesn't function normally.

Based on this scenario, what is occurring at the molecular level in a person with cystic fibrosis?
A) A recognition protein is being adversely affected.
B) A carrier protein is being adversely affected.
C) A receptor protein is being adversely affected.
D) A channel protein is being adversely affected.
E) Protein filaments in the cytoplasm are being adversely affected.