-The Figure Above Represents a Pedigree for a Family in Which

-The figure above represents a pedigree for a family in which dark-shaded symbols represent individuals with one of the two major types of colon cancer.Numbers under the symbols are the individuals' age at the time of diagnosis.A slash through the symbol indicates that the individual is deceased.The affected woman in generation IV is thinking about her future and asks her oncologist (cancer specialist) whether she can know if any or all of her children will have a high risk of the same cancer.The doctor would be expected to advise which of the following: (I) genetic counseling; (II) prenatal diagnosis when/if she becomes pregnant; (III) testing to see whether she has the allele; (IV) testing to see whether her future spouse or partner has the allele?

A) I: genetic counseling only
B) II: prenatal diagnosis when/if she becomes pregnant
C) I: genetic counseling;II: prenatal diagnosis when/if she becomes pregnant;and IV: testing to see whether her future spouse or partner has the allele only
D) III: testing to see whether she has the allele only