Which of the following explanations best describes the difference between cystic fibrosis and Down syndrome?

ADown syndrome is caused by a DNA mutation, while cystic fibrosis is caused by a change in the structure of a chromosome.

BDown syndrome is caused by change in the number of a chromosome, while cystic fibrosis is caused by a DNA mutation.

CDown syndrome is caused by a change in the number of a chromosome, while cystic fibrosis is caused by a change in the structure of a chromosome.

DDown syndrome is caused by a DNA mutation, while cystic fibrosis is caused by a change in the number of a chromosome.