In Gubernatorial Political Races, Incumbency

In gubernatorial political races, incumbency

A) apparently provides no significant advantage since most incumbent governors have lost their bids for reelection during the past twenty years.
B) is the deciding factor, far outweighing money and the strength of the candidate's political party in the state electorate.
C) is rarely a factor because so few sitting governors can legally run for a second term.
D) provides an important edge over an opponent, as reflected in the fact that since the 1970s, about three-quarters of incumbents have retained their seats.