Option A: wouldn’t be correct since the civil war was from April 12, 1861-May 9, 1865
Option B: would also not be correct since 1850 comes after 1849 so instead of 1850 ending it would be starting.
Option C: could be a valid answer considering the other options given
Option D: Is also incorrect since A and B are wrong
If there was another option then it would be now of the above since none are valid answers
I hope this helps! :3