Final answer:
The 'rally round the flag' syndrome refers to a phenomenon in which the public shows solidarity during times of national crisis. This effect results in an increase in support and approval for the government and its leaders.
Step-by-step explanation:
The 'rally round the flag' syndrome refers to a phenomenon in which the public shows solidarity during times of national crisis (Option C).
During events such as international crises or national emergencies, there is often an increase in support and approval for the government and its leaders. This phenomenon is known as the 'rally round the flag' effect, as citizens unite and come together in times of crisis.
For example, during the 1995 bombing of the Oklahoma City Federal Building, President Bill Clinton delivered a speech to inspire and comfort the nation, which aided in the 'rally 'round the flag' phenomenon.