A commission has been formed to report on the nation' s preparedness for a major natural disaster. The commission' s report will not be effective unless the commission speaks with a unified voice. Since individual members of the commission have repeatedly expressed their own opinions about disaster preparedness in the news media well in advance of completion of the report, it will not be effective. The conclusion of the argument follows logically if which one of the following is assumed? ["The commission's report will not be effective if some of the commission members already had opinions about the nation's disaster preparedness even before the commission was formed.", 'Commission members who have expressed their opinions about disaster preparedness in the news media have also emphasized their commitment to producing an effective report.', "The commission will be able to speak with a uniform voice only if individual members' opinions about disaster preparedness are not made public before the report is completed.", "News organizations should not provide a platform for members of the commission to express their opinions about disaster preparedness if doing so will undermine the effectiveness of the commission's report."]