Answer:
The correct answer is option C. "rejected the legality of secession".
Step-by-step explanation:
In 1860, according to the United Constitution every state had the right to leave the Union, in what is known as secession. When Abraham Lincoln took the presidency seven southern states tried to seceded the Union under this law. However, Lincoln rejected the legality of secession with the premise that a government that allows secession will result into anarchy.