Political scientist: It is not uncommon for a politician to criticize his or her political opponents by claiming that their exposition of their ideas is muddled and incomprehensible. Such criticism, however, is never sincere. Political agendas promoted in a manner that cannot be understood by large numbers of people will not be realized for, as every politician knows, political mobilization requires commonality of purpose. Which one of the following is the most accurate rendering of the political scientist's main conclusion? ['People who promote political agendas in an incomprehensible manner should be regarded as insincere.', 'Sincere critics of the proponents of a political agenda should not focus their criticisms on the manner in which that agenda is promoted.', 'A politician criticizing his or her political opponents for presenting their political agendas in an incomprehensible manner is being insincere.', 'To mobilize large numbers of people in support of a political agenda, that political agenda must be presented in such a way that it cannot be misunderstood.']