How Did the Civil War Begin

How did the Civil War begin?

A) Lincoln got into a heated public argument with Jefferson Davis, and rather than issuing an apology, Lincoln issued a formal declaration of war as part of his inauguration speech.
B) Lincoln gave the South a deadline by which they needed to return to the Union to avoid breaking the law and facing reunification by force, but the South brazenly allowed this deadline to pass.
C) Jefferson Davis ordered Major Robert Anderson to abandon Fort Sumter and instead engage in diplomacy, but Anderson ignored the Confederate president's commands and launched an attack.
D) The U.S. Constitution had always described slavery as an evil, and Congress finally managed to reach a consensus that the practice had indeed forever been against the law.
E) Despite warnings that if the South were to fire first it would unite the public opinion of northerners against secessionists, Confederates began firing their cannons at Fort Sumter.