Consider the graph of U.S. House and Senate Reelection Rates, 1964-2018 in the tutorial. Which of the following statements does the data in the graph support? a.) On average, about 60% of incumbents are reelected to the House and the Senate in each election. b.) The incumbency advantage is a minor factor in whether a person wins a congressional election. c.) The reelection rate of incumbents in both the House and the Senate has decreased over time. d.) The incumbency advantage is stronger in the House than in the Senate