James A. Garfield by BarkerC

Question 6

Though Garfield was seen as a largely ethical member of Congress, he was ensnared in the "Salary Grab" scandal of 1873 where an amendment to a bill gave Congress a 50% pay raise retroactive to 1871. By number, what NOW current amendment to the U.S. Constitution would have rendered this scandal moot had it been in the Constitution in 1873?