Each increase of 1 percent in real disposable personal income per capita will increase the share of the electorate for an incumbent by about 2.2 percentage points, other things being equal. Since 1952 there has been a decline in real disposable income during only one presidential election year. The incumbent lost that election.

Which of the following conclusions can be properly drawn from the statements above?

• AWhen an incumbent runs for office, he or she is likely to win===  
• BPolitical parties should take care to put forth a candidate who seems prosperous  
• CPresidential candidates should put their greatest efforts into improving their public image  
• DBecause a presidential campaign requires the expenditure of large amounts of money, it frequently impoverishes a candidate and his or her supporters  
• EThe outcome of a presidential election is substantially affected by factors other than the ideological positions of the candidates