Researchers Studied the Genetics of Helicobacter Pylori, a Stomach Bacterium

Researchers studied the genetics of Helicobacter pylori, a stomach bacterium that is present in about half of the world, to see if H. pylori geographic patterns reflect those of their human host. What were the results of their study?

A) They found ambiguous genetic clusters that roughly corresponded to continent scale geography; genotypes revealed a continuous gradation of genetic composition from one region to the next.
B) They found distinct genetic clusters corresponding to continent scale geography; genotypes revealed sharp gradation from region to region rather than continuous gradation as seen in humans.
C) They found distinct genetic clusters corresponding to continent scale geography; genotypes revealed a continuous gradation of genetic composition from one region to the next rather than sharp divisions as seen in the human genotypes.
D) Although there was congruence in the migratory patterns revealed in each data set, the divisions in the human data were not as sharp from one region to the next as the H. pylori data were.