Journalist: The advice of social scientists is frequently overlooked by politicians making social policy. Because it is not unreasonable to discount scientific assertions backed by weak evidence, politicians should not generally be criticized for ignoring social science, for social scientists, unlike physical scientists, seldom agree on the claims made even within their own specialty. Which one of the following is an assumption required by the journalist's argument? ['The failure of scientists to agree that a claim within their specialty is true can indicate that the evidence for the claim is not strong.', 'Only policy that is based on scientific findings is credible.', 'Politicians should follow the advice of experts on issues about which those experts agree among themselves.', "When creating policy, politicians' decisions should be determined by relevant scientific findings, except when the evidence for those findings is weak."]