trying to undermine support for a certain policy by pointing out that factors other than the policy itself could account for the results attributed to that policy providing evidence that because the officials charged with enforcing a certain policy often fail to perform their duty that policy is sure to have little effect raising a possible objection to a certain policy in order to show that the objection is in fact irrelevant to the particular situation the policy was designed to address arguing that a certain policy is bound to fail because an event that is likely to defeat the aim of the policy falls outside the policy's influence
Britain is now rabies free. Nevertheless, Britain' s strict quarantine of imported domesticated animals, designed to prevent widespread outbreaks of rabies there, cannot succeed indefinitely in preventing such outbreaks. Bats, which are very susceptible to rabies, fly into Britain from continental Europe. Since wild bats cannot be quarantined, this policy cannot control rabies spread by wild bats.
Which one of the following is an argumentative strategy employed in the argument?