Domesticated animals, such as dogs, have come into existence by the breeding of only the individuals of a wild species that are sufficiently tame. For example, if when breeding wolves one breeds only those that display tameness when young, then after a number of generations the offspring will be a species of dog. Therefore, all animals can, in principle, be bred for domesticity.
Which one of the following, if true, most weakens the argument?The argument generalizes from wolves/dogs to all animals.
The key assumption is that every animal species has at least some members that show enough
tameness to be selectively bred. If some species never have tame members, the process cannot even begin.
(A) Domesticated animals cannot be turned into wild species by breeding only those animals that display some wild characteristics.
This is irrelevant. The argument is about breeding wild animals toward domesticity, not breeding domesticated animals back into wild species.
(B) In some animal species, wild members mate more frequently than tame members.
This weakens only slightly, if at all. Even if tame members mate less frequently, selective breeding may still be possible.
(C) In some animal species, no members ever display tameness.
This is correct. If some species have no tame members, then breeders cannot select tame individuals from those species. That directly weakens the claim that all animals can, in principle, be bred for domesticity.
(D) In some animal species, tame members are less fertile than wild members.
This may make domestication harder, but it does not show that domestication is impossible. Less fertile does not mean infertile.
(E) In some domesticated animal species, some members are much more tame than other members.
This does not weaken the argument. It is consistent with selective breeding for tameness.
Answer: (C)