Impeachment offenses are a. charged by the House and tried in the Senate, with the Chief Justice presiding and a 50 percent plus one vote needed for conviction. b. charged by the House and tried in the Senate, with the Chief Justice presiding and a two-thirds vote needed for conviction. c. charged by the Senate and tried in the House, with the Chief Justice presiding and a two-thirds vote needed for conviction. d. charged by the Senate and tried in the House, with the Chief Justice presiding and a 50 percent plus one vote needed for conviction.