The accompanying figure shows a pedigree and the results of a Southern blot analysis of the -globin ...

The accompanying figure shows a pedigree and the results of a Southern blot analysis of the -globin gene for four family members (II-1, II-2, II-4, and II-5). III-2 was just born and neither her health nor her DNA has been analyzed.
 
  The figure also shows a restriction map of A and S alleles and the location of three DNA probes (A, B, and C). If III-2 is analyzed by Southern blot using the same probe(s) as that used on other members of the family, what is the probability that the result will be only one band? A) 0
  B) 1/9
  C) 1/6
  D) 1/4
  E) 2/3