Among the alleles for the gene responsible for cystic fibrosis that have been identified, one mutant has been identified in which the protein is truncated prematurely with no errors in the sequence prior to the termination. What change in the DNA sequence of the gene would not be able to cause such a mutation? (Choose the best answer): Select one: O A. a single base pair deletion O B. insertion of three adjacent base pairs Oc. deletion of three adjacent base pairs O D. a change of a C to a Tin the coding sequence of the gene O E. a change of a T to a C in the coding sequence of the gene