Answer: c. Johnson’s lawyers assured moderate Republicans that he would behave for the rest of his term, so several voted to acquit him
Step-by-step explanation:
The votes of about seven moderate Republicans in addition to 12 Democrats Senators gave an edge to President Johnson in what many scholars have termed a weak case for impeachment who was voted guilty by 35 Senators.
The reason why he was acquitted despite the charges against him for impeachment was that the votes that convicted him fell short of a two-thirds majority.