Why Did Confederate President Jefferson Davis's Greatest Challenges Come from Other

Why did Confederate President Jefferson Davis's greatest challenges come from other southern politicians?

A) They all coveted the office of the presidency, and many different plots emerged to impeach him during wartime.
B) Many of them remained opposed to the war and had long believed the human toll was far from worth it.
C) Their insistence on states' rights made it difficult for the Confederate government to exert its authority.
D) Republicans and Whigs had achieved the majority in the Confederate Congress during a wartime election.
E) A large faction of the Confederate Congress opposed Davis's efforts to end slavery to repair relations with the Union.