Jeff's Mother Died from Huntington's Disease and He Inherited the Huntington's

Multiple Choice

Jeff's mother died from Huntington's disease and he inherited the Huntington's gene.What is the likelihood he will also develop symptoms of Huntington's disease?

A) Jeff will almost certainly develop Huntington's.
B) Jeff's odds of developing Huntington's are 1 in 2.
C) Jeff's odds of developing Huntington's are 1 in 4.
D) Jeff's odds of developing Huntington's depends on the gene he inherited from his father.