Agenetic counselor is consulted by a young man who is worried about developing huntington's disease, an inherited disorder caused by a dominant allele of a single gene. the young man explains that his cousin was recently diagnosed with huntington's disease, and the news has caused him to consider his own risk of developing the disorder. which of the following questions will best the genetic counselor to evaluate the risk of the young man developing huntington's disease and transmitting it to his children?

(a) were you and your cousin born in the same geographical area?
(b) were your parents or grandparents ever diagnosed with huntington's disease?
(c) were you in physical contact with a person diagnosed with huntington's disease?
(d) were you ever exposed to substances that are suspected of causing huntington's disease?