Which of the following BEST explains why President Lyndon Johnson, subsequent to President Kennedy’s assassination, did not have the support of a vice president? A. His vice president proved to be too inexperienced to perform his duties. B. His vice president had to resign immediately due to allegations of tax evasion. C. The office remained vacant because there were no procedures for naming a new vice president. D. While the 25th Amendment allowed President Johnson to appoint a vice president, his nominee was tied up in Congressional hearings and interviews for most of Johnson’s first term.