Though certain breeds of dog are renowned for their sense of smell, there
is often a greater difference in scenting ability between two members of a single breed as there is between members of different breeds.
Meaning analysis: Some breeds of dogs are well known for their sense of smell. But, there is a big difference in the scenting ability between two members in the same breed compared to between two members of different breeds.
So if X and Y are two different breeds and if A and B belong to breed X then... there is a big difference in the scenting ability between A and B as compared to between X and Y.
Sentence Structure: Though
(contextual word that means there is some change/difference in the direction the information is going to be presented)certain breeds
(subject)of dog
(prepositional phrase that modifies "breed")are renowned
(verb)there is
(verb)for their sense of smell
(prepositional phrase that gives additional information stating "for what" the dogs are renowned)often a greater difference ("greater" is the comparison word)
in scenting ability
(this is the property on which the comparison is being made)between two members of a single breed (element 1 of comparison)
as there is
("as" is used to mark the end of the comparison marker) (the correct comparison marker is "greater than")between members of different breeds.
(element 2 of comparison)Quote:
(A) is often a greater difference in scenting ability between two members of a single breed as there is
As mentioned in the Sentence structure, the correct comparison marker is "greater than" and not "greater as"
Quote:
(B) is often more difference in scenting ability between two members of a single breed as to find one
Again, the correct comparison marker is "more than" and not "more as". Moreover, the phrase "to find one" makes the sentence inferior. "between two members of a single breed" cannot be parallel to "to find one"
Quote:
(C) is often a greater difference in scenting ability between two members of a single breed than
Correct. All entities are made parallel. The correct comparison marker "more... than" rectifiers the comparison error.
Quote:
(D) are often greater differences in scenting ability between two members of a single breed as there are
Same error as (A). Note, "there are greater differences..." is parallel to "there are between...". I believe the parallelism out here is correct.
Quote:
(E) are often greater differences in scenting ability between two members of a single breed than there is
Here the singular verb "is" is used for plural entity "differences".
Correct Choice:
(C)