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A is often a greater difference in scenting ability between two members of a single breed as there is

B is often more difference in scenting ability between two members of a single breed as to find one

C is often a greater difference in scenting ability between two members of a single breed than

D are often greater differences in scenting ability between two members of a single breed as there are

E are often greater differences in scenting ability between two members of a single breed than there is