Should there be a(n) leaving the president, vice president, speaker of the house, and president pro tempore unable to assume the duties of the president, the cabinet represents
a.
catastrophe . . the presidential order of succession
b.
security threat . . the body that appoints a new president to office
c.
catastrophe . . the office of the president until a new president is elected
d.
security threat . . the supreme authority in government until the threat is eliminated

The correct answer is D. Should there be a security threat leaving the president, vice president, speaker of the House, and president pro tempore unable to assume the duties of the president, the Cabinet represents the supreme authority in government until the threat is eliminated.  

Explanation:

The line of presidential succession of the United States is the order of the officials who can become or act as president of the United States if the incumbent president becomes incapacitated, dies, resigns or is dismissed. The line of succession is established by the Constitution of the United States and the Presidential Succession Act of 1947, subsequently amended to include newly created cabinet offices. The succession follows the order of the vice president, the president of the House of Representatives, the president pro tempore of the Senate, and then the heads of the federal executive departments that make up the Cabinet of the United States. The Cabinet currently has fifteen members, beginning with the Secretary of State and followed by the rest in the order of creation of their positions.

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