SajjadAhmad
Although all dogs are descended from the wolf and the jackal, the various breeds of dog are so different from one another that it hardly seems possible that they had a common ancestry.
(A) are so different from one another that it hardly seems possible that they had a common ancestry.
(B) are so different from each other that it hardly seems possible that they have a common ancestry.
(C) are so different, one from another, that their having a common ancestor hardly seems possible.
(D) being so different from one another makes it hard to believe that they had a common ancestry.
(E) that having a common ancestry hardly seem possible in that they are so different from one another.
The answer is A as follows.
2 concepts are tested here.
1. Subject verb agreement - breeds will take plural verb
2. Use of "one another" when more than 2 items are compared.
(A) are so different from one another that it hardly seems possible that they had a common ancestry. -
[Correct] Use of "are" is consistent with breeds. "one another" is correctly used to compare more than 2 breeds(B) are so different from
each other that it hardly seems possible that they have a common ancestry. -
"each other" is wrongly used(C) are so different,
one from another, that
their having a common ancestor hardly seems possible. -
"one from another" is the main problem here. However there are many more issues with this sentence.(D)
being so different from one another makes it hard to believe that they had a common ancestry. -
Use of "being" is usually wrong in GMAT(E) that having a common ancestry hardly seem possible in that they are so different from one another -
Whole construction seems awkward. No reason to choose this when clear and simple choice A is avaialbe