Which of the Following Is True of Johnson's Impeachment Trial

Which of the following is true of Johnson's impeachment trial?

A) Ironically, Johnson was saved by the Radical Republicans, who argued that impeachment should not be used as a political weapon.
B) Because of public outrage at the way Johnson was being forced out of office, the Senate voted to acquit him.
C) Johnson's acquittal by the Senate established the precedent that Congress could not use impeachment as a political weapon against the President.
D) Although Johnson was found guilty, his appeal to the Supreme Court prevented his removal from office.