Biologist: Researchers believe that dogs are the descendants

The author Intends to state that the dogs having more similarity in genetic traits with that of wolves are recently domesticated than the dogs breed having less similar genetics of a wolf.

The option stating the intended meaning is;

(A) If one breed of dog is descended from wolves that were domesticated more recently than were the wolves from which most other breeds of dog are descended, the former breed may be more closely related to wolves than those other breeds are.(the author intends to state the breed of dogs having more genetic similarity with that of wolf irrespective of its kind is recently domesticated, which is generalized not bifurcated into one) (incorrect)

(B) If one breed of dog is more closely related to wolves than to another breed of dog, then the former breed of dog has more recent undomesticated wolf ancestors than the latter breed has.(yes, if a dog breed is closely related to a wolf, there are chances that it's ancestors were recently domesticated than rest) (correct)

(C) Any breed of dog descended from wolves that were domesticated is more closely related genetically to at least some other breeds of dog than to wolves.(dogs are descendants of wolf, they both must be sharing some similarities even if they were domesticated at any point of time) (incorrect)

(D) If one breed of dog is more closely related to wolves than another breed of dog is, then the former breed of dog is more closely related to wolves than to the latter breed of dog.(all breeds of dogs are related to that of wolf, we can't specify one) (incorrect)

(E) Any two breeds of dog that are more closely related to each other than to wolves are both descended from wolves that were domesticated long ago.(all of the breeds who are similar to each other or not, share traits with their wolf ancestors, irrespective of the time of their domestication) (Incorrect)

IMO B

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