Henry Kissinger Earned His Appointment as Nixon's National Security Advisor

Henry Kissinger earned his appointment as Nixon's National Security Advisor by

A) His loyal service to a series of Republican presidents
B) Undercutting the Johnson administration's efforts to achieve a bombing halt in Vietnam by tipping off Nixon's campaign
C) Working to achieve peace in Vietnam and laying the groundwork for Nixon to be the president to successfully end the war
D) His similarity to Nixon in background and education