Final answer:
The Emancipation Proclamation was not an action by Andrew Johnson that the Congressmen opposed, as it was issued by Abraham Lincoln. Johnson's actual controversial actions included his attempt to dismiss Edwin Stanton and opposition to civil rights, which led to his impeachment.
Therefore, option A is coorect.
Step-by-step explanation:
Among the actions taken by Andrew Johnson, the Emancipation Proclamation does not support the opinion of Congressmen who opposed him. The Emancipation Proclamation was issued by President Abraham Lincoln, not Andrew Johnson. On the other hand, Johnson's defiance against civil rights legislation, his opposition to the Tenure of Office Act by attempting to remove Secretary of War Edwin Stanton, and his general resistance to Congressional Reconstruction efforts were all reasons why he was opposed by many in Congress. These actions led to the first impeachment of an American president, where Johnson narrowly escaped removal from office by just one Senate vote.