Why did the House of Representatives impeach President Johnson?

a- He had not been elected by the voters.
b-He had fired the Secretary of War illegally.
c-He had appointed temporary southern governors.
d-He had required states to approve the Thirteenth Amendment.

I think it is b. Please let me know if I am correct ASAP. Thank you :)

1 answer

https://en.wikipedia.org/wiki/Impeachment_of_Andrew_Johnson

Yes, B.