How Was the Secession Movement in South Carolina Different from Secession

How was the secession movement in South Carolina different from secession in other Southern states?

A) The South Carolina state convention voted unanimously to leave the Union.
B) South Carolina did not leave the Union until after war broke out with the North.
C) South Carolina's decision to secede was opposed by the planter elite of the low country.
D) Yeoman farmers living in South Carolina's up-country opposed secession and, instead, joined the Union as a free state.