Why did the crisis at fort sumter pose a challenge for president lincoln?

a. he could not accept secession, but he also wanted to avoid war.

b. the fort was strategically placed so that it was impossible to take control of it by force.

c. the confederacy allowed supply ships into the fort, but still demanded its surrender.

A. He could not accept secession, but he also wanted to avoid war.

Explanation:

President Abraham Lincoln had ordered to resupply Fort Sumter, and he even informed the South Carolina´s authorities, thus he made it public. But the Confederates demanded control over the fort. Southern units opened fired on Fort Sumter on April 12, 1861, the first shots of the Civil War. Lincoln wanted to avoid war, but he couldn´t allow US federal property to be taken by force.