Answer:
The correct answer is B. The period since 1968 is called an era of divided government because no single party has held the presidency and majority of Congress for an extended period.
Step-by-step explanation:
Divided government means the divergence between the party membership of the President of the United States and the party membership of the majority in Congress (consisting of the Senate and the House of Representatives). If the majority in both chambers of Congress and President belong to the same party, it is a unified government. The terms divided government and unified government are also used to refer to governors and state parliaments.