Union troops continued to occupy Fort Sumter in 1860 because

A: the Confederacy could not seize federal property.
B: the United States had not officially recognized the right to secede.
C: the North and South had agreed not to seize each other’s forts.
D: the fort had strategic value only to the Union.

b

explanation:

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.