For each pair below, underline the one that is a cause of, or reason for, the other.
1. Spiro Agnew resigns as vice president.
2. President Richard Nixon nominates Gerald Ford as vice president.
3. Vice President Ford becomes president.
4. President Nixon is forced to resign.
5. Nelson Rockefeller becomes vice president.
6. President Ford nominates Nelson Rockefeller as vice president.
7. The Speaker of the House becomes president.
8. Both the president and vice president are unable to carry out their duties.
9. If the Speaker of the House is unable to carry out the duties of the president, the president pro tem of the Senate takes over.
A. 1, 2, 3, 4, 5, 6, 7, 8, 9
B. 2, 4, 6, 7, 8, 9
C. 2, 4, 7, 8, 9
D. 4, 7, 8, 9