Three common ways to repair changes in DNA structure are nucleotide excision repair, mismatch repair, and homologous recombination repair. Which of these three mechanisms would be used to fix the following types of DNA changes?
A. A change in the structure of a base caused by a mutagen in a nondividing eukaryotic cell
B. A change in DNA sequence caused by a mistake made by DNA polymerase
C. A thymine dimer in the DNA of an actively dividing bacterial cell