Senatorial elections are not held at the end of every six-year term. They are actually scattered over the six-year term so that not all Senators are up for re-election in the same year. How are Senatorial elections spread out? A. Approximately 1/6 of Senators are up for re-election every year. B. Approximately 1/3 of Senators are up for re-election every two years. C. Approximately 2/3 of Senators are up for re-election every three years. D. Approximately 1/2 of Senators are up for re-election every three years.