GMAT Sentence Correction (SC) | Re: Though certain breeds of dog are renowned for their sense of

Though certain breeds of dog are renowned for their sense of smell, thereis often a greater difference in scenting ability between two members of a single breed as there is between members of different breeds.

A. Ditto
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