The Difference in Mode of Inheritance Between Huntington Disease and Cystic

The difference in mode of inheritance between Huntington disease and cystic fibrosis is that

A) Huntington disease skips generations and only affects children,whereas cystic fibrosis can strike at any age and never skips generations.
B) Huntington disease does not skip generations but cystic fibrosis can.
C) A person with Huntington disease can have unaffected parents,but a person with cystic fibrosis must have an affected parent.
D) Huntington disease affects females and cystic fibrosis affects males.