What was the last effort to prevent the south from seceding?

The Crittenden Compromise introduced by  senator John Crittenden on 12th December 1860 was the last effort to prevent the secession of the South. It was aimed to resolve the secession crises by political negotiations ; allowing the existence of slavery in southern slave  states and to re-establish the Missouri Compromise Line.The proposal failed to get the required approval because many southern states already began to secede and so did not vote on it.

the answer is b. hope this !

the safahids used force when persuasion to convert from being a sunni muslim to embrace shi'ism was not effective. they also persecute shi'ites who have different views from their imposed teachings.