A Genetic Counselor Is Meeting with a Couple Considering Trying

A genetic counselor is meeting with a couple considering trying to become pregnant. One of the prospective parents tells the counselor that her father has Huntington's disease. The counselor will probably tell this couple

A) that the chance of their child having Huntington's disease is relatively low because they would need to pass on two recessive genes for the disease
B) that any child they have together has a 100 percent chance of developing Huntington's disease
C) to adopt rather than have a biological child because it is impossible to calculate the chance that their offspring will have Huntington's disease
D) that any biological children they have will develop Huntington's if they receive even one mutant HD gene