What would be the most likely reason that the scientist did not test the other half of the German Brethren that adopted more modern ways?

a. The distance between the Old Order and the group they left was not far enough to cause any changes in allele frequencies.

b. This group had allele frequencies that were not diverse enough for the study.

c. The Old Order did not have any genetic similarities with the original group, so there was no need to test them.

d. The groups' allele frequencies would most likely be affected through the marriage of others that were not part of the original group.