The Most Common Mutation Responsible for Cystic Fibrosis

The most common mutation responsible for cystic fibrosis

A) introduces an early stop codon producing a shortened protein.
B) is deletion of one amino acid from the normal protein.
C) is the change of a single amino acid from the normal protein.
D) is due to the loss of both copies of the gene for chloride ion transport.
E) is due to an extra copy of the chromosome containing the chloride ion transport gene.