According to the first paragraph, why public officials and candidates for public office routinely use public opinion polls

A．Reagan lost a lot of support later in his administration
B．leaders should learn to win support for their policies
C．it is up to the leaders to determine the value of public opinion
D．public opinion polls are very important to a democratic society

A．some government leaders can never run the government effectively
B．in solving any problem, leaders should first try to find out the public opinion on it
C．good leaders should learn to disregard public opinion in policy making
D．leaders should take effective decisions based on sound judgment and act on them with determination